Abstract Summary
Rehabilitation following anterior cruciate ligament (ACL) injury may be facilitated by a greater understanding of ACL force during activities used to prepare athletes for return to sport. Peak ACL tension and ACL impulse were compared among 40 recreational athletes during 8 rehabilitation activities. ACL peak force and impulse varied significantly between activities. Greater ACL peak force was observed during all single leg activities compared to double limb activities. ACL peak force and impulse were greatest during single leg landings, potentially underscoring the significance of this activity relative to ACL injury mechanisms.