
Purpose. Trains the ankle and foot to behave like a stiff spring on one leg. Because running and most change-of-direction actions are single-leg tasks, developing elastic qualities on one leg transfers more directly than double-leg hopping alone.
How it fits the system. An entry-level to intermediate reactive drill that sits earlier in a plyometric progression than single-leg depth jumps. It builds the tendon stiffness and ankle control that heavier reactive work depends on.
Gastrocnemius, Soleus
Tibialis Anterior, Intrinsic Foot Muscles, Quadriceps, Gluteus Medius
Single-Leg Reactive Hop
Bodyweight
Intermediate
The intent is minimal ground contact time with the ankle doing most of the work. The knee stays relatively quiet and only slightly bent; if the knee starts flexing deeply the drill has become a single-leg squat jump and no longer trains ankle stiffness.
Single-leg hopping also exposes frontal-plane control. If the pelvis drops or the knee falls inward on contact, that indicates the hip abductors are not controlling the landing, and it is worth addressing before adding reactive volume.
Because all bodyweight passes through one limb, cumulative loading on the Achilles tendon and plantar structures is meaningful. Volume should be counted in total contacts per leg and built gradually.
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