8.5 Reactive/Plyometric Training Progressions

Plyometrics Are About Loading and Responding

Reactive training is NASM's term closely associated with plyometric training. It develops the body's ability to respond to ground contact, external force, or a rapid change in direction. The purpose is not just jumping high. The purpose is to improve the stretch-shortening cycle while preserving alignment, control, and appropriate impact.

The stretch-shortening cycle has three parts. The eccentric component loads the tissue as the body decelerates or lengthens under force. The amortization phase is the brief transition where the body stabilizes and redirects force. The concentric component unloads force explosively. A long, sloppy transition reduces power and increases risk.

Reactive stabilization belongs early because landing skill comes before repeated jumping. A squat jump with stabilization teaches the client to land softly, keep knees aligned, control the trunk, and hold the finish. If the landing is loud, stiff, uneven, or collapsed, the trainer should regress to a step-up, step-down, smaller jump, or body-weight deceleration drill.

Reactive strength adds repeated elastic actions. Tuck jumps and squat jumps demand faster eccentric-to-concentric transitions and more total contacts. They require enough core, balance, and strength to maintain posture under fatigue. The exam may use volume clues such as foot contacts, because every landing adds stress.

Reactive power is the most demanding category. It may include faster ground contacts, multiplanar hops, box run steps, or ice skaters. These drills are valuable for sport and high-level function, but they are not the first answer for a poorly conditioned client. Read the assessment and training history before selecting them.

NASM's plyometric guidance emphasizes safe progression from easy to challenging, simple to complex, known to unknown, stable to unstable, body weight to loaded, and general to activity-specific. That phrase is useful for exam decisions. If two answers both sound plausible, choose the one that progresses one step at a time and preserves mechanics.

The integrated workout order also matters. Reactive training usually follows warm-up, core, and balance, and appears before SAQ and resistance training when included. This lets the client practice fast movement while still fresh. High-quality reactive training should not be buried after exhausting strength sets unless the program has a specific advanced purpose and adequate safeguards.

Reactive training is not only for athletes. A general client may need to step off a curb, recover from a trip, or change direction while walking a dog. The trainer can scale the drill to the client. A low box step-down to stabilization may be enough. A depth jump may be inappropriate.

Use this exam shortcut: if the drill lands and holds, it is reactive stabilization. If it repeats jumps, it is reactive strength. If it is fast, powerful, and high demand, it is reactive power. Then confirm that the client has earned that level.