2.5 Power Development and Explosive Strength

The short version

Strength is how much force you can produce. Power is how fast you can produce it. Sport almost never gives you time, so power is usually the thing that decides the outcome. A grinding four-hundred-kilo deadlift and an explosive jump squat are both maximal efforts, but they sit at opposite ends of the same spectrum, and only one of them looks anything like a game.

This article is about the fast end: what power actually is, why strength is the ingredient rather than the finished dish, and how to train the gap between being strong and being explosive.

Strength is the ingredient, power is the recipe

Force takes time to build. A heavy squat gives you a couple of seconds to get to your peak. A jump gives you around a quarter of that. A foot hitting the ground during a sprint gives you about a tenth of a second, and then the opportunity is gone. So the question is never just how much force you have. It is how much of it you can get out before the moment ends.

Two cars, same engine. One is geared for towing, the other for acceleration. They can both do impressive work, but only one of them wins a drag race. Plenty of athletes are built for towing and then wonder why they lose the first two steps.

Strength still sets the ceiling. You cannot apply force quickly that you do not have at all, which is why very weak athletes should get stronger before worrying about being explosive (Suchomel et al., 2016). But past a reasonable level of strength, more strength stops helping much on its own. The lifter who squats double bodyweight and jumps badly does not need a bigger squat. He needs to learn to express what he already owns, quickly.

Speed of intent is the actual training variable. This is the part that gets missed. The same exercise trains different things depending on how hard you try to move the bar. A moderate weight lifted with genuine intent to accelerate builds power. The identical weight lifted casually builds very little. There is no way to fake this and no way to measure it from the outside. It has to be trained deliberately, every rep.

Which means quality decides everything and fatigue ruins it. Power work lives in the first few reps, while the nervous system is fresh. Sets of three to five, long rests, and the session stops the moment the movement slows down. Grinding out ten sloppy jumps because ten was written on the paper turns a power session into conditioning with extra injury risk.

You can load the fast end from either side. Heavy work at moderate speed raises the force you have available. Light, fast work at high velocity teaches you to move quickly. Both matter, and athletes usually need whichever one they have been ignoring. Someone strong and slow needs the light and fast. Someone fast and fragile needs the heavy. Programming power well is mostly working out which of those two describes the person in front of you.

The free elastic bonus. A movement that dips before it drives, like a countermovement jump, gets extra output from the stretch stored in muscle and tendon. It is genuinely free, and it can be trained: bouncing, hopping and rebounding work make an athlete better at using it. This is also why a jump from a dead stop is noticeably worse than one with a countermovement, and why testing both tells you something useful about what to fix.

It shows up where it counts. A basketball player’s vertical, a striker’s first three steps, a fighter’s straight right, a hockey player’s first stride out of the corner: all of these are the same quality wearing different clothes. None of them are decided by who could lift the most in a quiet gym in February.

The rest of the article gets into the machinery: the force-velocity curve and what it means for exercise selection, rate of force development, contrast and complex methods, how to test power without expensive equipment, and how to place power work inside a training week. Those sections are more technical, so read them when you want the detail.

Advanced Section: The Force-Velocity Relationship

The Force-Velocity Curve

As load increases, the velocity at which it can be moved decreases, and vice versa — this inverse relationship is the force-velocity curve. Maximal strength training (very heavy loads, low velocity) sits at one end; unloaded jumps and sprinting (very light relative load, very high velocity) sit at the other end; Olympic lift variations and jump squats with moderate loads sit in the middle. Peak power output typically occurs somewhere in the middle of this curve, not at either extreme, which is why a comprehensive power program trains across a range of loads rather than only very heavy or only very light work (Cormie et al., 2011).

The Force-Velocity Curve
Heavy Load, Low Velocity (Maximal Strength)
↓
Moderate Load, Moderate Velocity (Olympic Lifts, Jump Squats)
↓
Light Load / Bodyweight, High Velocity (Jumps, Sprints, Throws)

For a clear visual walkthrough of this concept, this video is an excellent primer: "Force Velocity Curve Explained" — The Movement System — Watch on YouTube.

Rate of Force Development

Rate of Force Development (RFD) measures how quickly force rises after a movement begins — essentially, the "steepness" of the force-time curve. Because many sports actions (a jump, a change of direction) allow only 100–250 milliseconds of ground contact, athletes with a higher rate of force development (RFD) can generate more usable force in that limited window even if their absolute maximal strength is similar to a competitor's (Cormie et al., 2011). RFD is trained through explosive-intent lifting, plyometrics, and ballistic movements — not through slow, grinding heavy lifts, which primarily train the later portion of the force-time curve (Cormie et al., 2011).

This concept is explained clearly and concisely here: "Rate of Force Development | Implications for Strength & Power Training" — Flow High Performance — Watch on YouTube. It connects directly to the neural drive concepts introduced in the Maximum Strength article earlier in this series.

The Stretch-Shortening Cycle: A Preview

Many of the most powerful natural movements (jumping, sprinting, change of direction) use the stretch-shortening cycle — a rapid eccentric loading phase immediately followed by an explosive concentric phase, aided by elastic energy storage in tendons (Cormie et al., 2011). This mechanism is central enough to athletic power that the next section of this series opens with a dedicated article on Plyometrics and the Stretch-Shortening Cycle, building directly on the force-velocity concepts introduced here.

Practical Section: Programming for Power

• Training intent: Every rep in a power-focused session should be performed with maximal intended speed, regardless of the actual load being moved — intent, not just load, drives the neural adaptations that improve RFD (Cormie et al., 2011).
• Load selection: Peak power for most lower-body lifts (e.g., jump squats, trap bar jumps) tends to occur around 0–40% of one-repetition maximum (1RM); Olympic lift variations are often most effective in the 60–80% range due to their technical demands (Cormie et al., 2011).
• Volume: Power work is typically performed in low reps (1–5) and moderate sets (3–6), because quality and speed degrade quickly with fatigue — more reps at reduced speed is a worse training stimulus, not a better one (Sheppard & Triplett, 2016).
• Rest periods: 2–4 minutes between sets to allow near-full recovery of the phosphocreatine system and to preserve movement speed across the session (Haff & Triplett, 2016).
• Sequencing: Power exercises are typically placed early in a session, when the nervous system is freshest, often paired with a heavier strength exercise in a "contrast" or "complex" method (e.g., a heavy squat followed shortly by a jump) (Sheppard & Triplett, 2016).
• Progression: Track bar speed or jump height where possible; a drop in these markers across a training block, despite similar loads, is an early sign of fatigue rather than adaptation.

Sport Applications

• Basketball/Volleyball: Vertical jump power is trained through a combination of heavy squats, jump squats, and depth jumps across the force-velocity spectrum.
• Football/Rugby: Power underlies acceleration off the line and contact power in blocking and tackling; Olympic lift variations and medicine ball throws are common tools.
• Sprinting: Power at very high velocities (unloaded or lightly loaded) is prioritized, since sprinting itself occurs at the far right end of the force-velocity curve.
• mixed martial arts (MMA)/Boxing: Striking power relies on rotational and upper-body RFD, trained through med ball throws, rotational cable work, and explosive pressing variations.
• Olympic Weightlifting: The sport itself is largely a direct power-training modality, sitting in the moderate-load, moderate-velocity region of the curve.
• Tennis: Serve and groundstroke power depend on rotational power and rapid force development through the kinetic chain, covered in more depth in the Rotational Power article later in this series.

Common Mistakes

• Training power exercises to fatigue, which trains slow, sloppy movement patterns rather than fast, crisp ones.
• Skipping a strength base and jumping straight into heavy power training, increasing injury risk without the tissue capacity to support it (Suchomel et al., 2016).
• Only training at one end of the force-velocity curve (either very heavy or very light) instead of covering the full spectrum relevant to the sport.
• Neglecting technical coaching on Olympic lift variations, where poor technique blunts the power benefit and raises injury risk.

Coaching Cues

• "Move it like it's light, even when it isn't." Reinforcing intent and speed regardless of the actual load.
• "Quality reps, not more reps." A reminder that fatigue is the enemy of power training.
• "Fast in, fast out." A cue for minimizing ground contact or transition time in jumps and lifts alike.

FAQs

Do I need to be very strong before training for power? A reasonable strength base helps, since power is partly built on the strength ceiling discussed in the Maximum Strength article, but power-relevant training (jumps, throws, sprint work) can be introduced progressively alongside strength development rather than strictly after it.

Rate of Force Development Explained! — The Movement System. Defines rate of force development and why peak strength alone does not predict explosiveness.

Is Olympic weightlifting necessary for power development? No — Olympic lift variations are an effective but not exclusive tool; jump squats, medicine ball throws, and sprint-specific work can build power effectively, especially where coaching expertise for Olympic lifts is limited.

How is power different from the plyometric training covered later in this series? Power development, as covered here, includes a broad range of methods including loaded lifts; the plyometrics section that follows focuses specifically on the stretch-shortening cycle and unloaded, reactive, ground-contact-based methods like jumps and bounds.

Recommended Videos

"Rate of Force Development | Implications for Strength & Power Training" — Flow High Performance — Watch on YouTube. A concise explanation of RFD and why it matters more than maximal strength for most athletic movements.

"Force Velocity Curve Explained" — The Movement System — Watch on YouTube. A clear visual breakdown of the force-velocity relationship that underpins power programming decisions.

References

Cormie, P., McGuigan, M. R., & Newton, R. U. (2011). Developing maximal neuromuscular power: Part 1 – biological basis of maximal power production. Sports Medicine, 41(1), 17–38.

How to Power Clean [From Olympic Weightlifter Darren Barnes] — Squat University. A technical breakdown of the power clean, the most common loaded expression of triple extension.

Cormie, P., McGuigan, M. R., & Newton, R. U. (2011). Developing maximal neuromuscular power: Part 2 – training considerations for improving maximal power production. Sports Medicine, 41(2), 125–146.

Suchomel, T. J., Nimphius, S., & Stone, M. H. (2016). The importance of muscular strength in athletic performance. Sports Medicine, 46(10), 1419–1449.

Haff, G. G., & Triplett, N. T. (Eds.). (2016). Essentials of Strength Training and Conditioning (4th ed.). Human Kinetics.

Sheppard, J. M., & Triplett, N. T. (2016). Program design for resistance training. In G. G. Haff & N. T. Triplett (Eds.), Essentials of Strength Training and Conditioning (4th ed.). Human Kinetics.

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