The goal of this study is to learn whether a 6-week lower-body training program using closed kinetic chain (CKC) exercises with slow, controlled movements (called "eccentric time under tension") can improve leg muscle strength and muscle-tendon viscoelastic properties in male university soccer players. The Main Questions Are: 1. Does this type of training improve knee strength? 2. Does it change the way muscles and tendons respond to movement or pressure? What Will Participants Do? 1. Join one of two groups: one does the CKC training program, the other continues regular soccer training 2. Train twice a week for 6 weeks 3. Have their leg strength tested using special equipment 4. Have their muscle and tendon properties measured with a handheld device
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Change from baseline in the rotational peak torque relative to body mass at 6 weeks
Timeframe: From enrollment to the end of closed kinetic chain training protocol at 6 weeks
Change from baseline in the rotational mean power at 6 weeks
Timeframe: From enrollment to the end of closed kinetic chain training protocol at 6 weeks