How should hamstring strain rehab progression be approached according to NSCA principles?

• A. Time-based progression with increasing mileage.
• B. Immediate return to full-speed sprinting after pain-free status.
• C. Criterion-based progression from controlled pain-free ranges to resistive eccentric loading, then sprint-specific drills, and gradual reintroduction to high-speed running with medical clearance.
• D. Only passive stretching before every session.

Answer: (C)

The main idea is to use a criterion-based, staged rehab plan that mirrors the demands of sprinting and protects the healing hamstring. Start with movements that are pain-free and controlled, then progressively add loading through resisted eccentric work to rebuild strength and length-tension properties. Once strength and control are established, move to sprint-specific drills that recreate the mechanics and neuromuscular demands of running, and only after those are well tolerated should you reintroduce high-speed running, and this should occur with medical clearance and functional criteria met.

This approach works because eccentric hamstring strength and the ability to control the muscle during lengthening are crucial for sprinting and reducing re-injury risk. Advancing based on objective criteria (pain status, strength benchmarks, functional tests) helps ensure the tissue has the capacity to handle increasing demands, rather than relying on time alone. Immediate full-speed return after pain-free status ignores the need for progressive loading and functional readiness. Conversely, relying only on passive stretching misses the necessary strength, load tolerance, and sprint-specific control needed for safe return.