Final answer:
The options provided are various methods to intensify exercises in the context of resistance training, adhering to the PROS principle for progression. They are strategies used to increase the challenge in workouts to induce muscle hypertrophy and strength gains.
Step-by-step explanation:
The question pertains to the progression of resistance training, which is a component of the PROS principle (Progressive Resistance Overload Specificity). This principle emphasizes the need to progressively increase the challenge in strength training to continue building muscle and strength. Options provided such as a) Increase resistance, b) Increase number of reps, c) Increase lifting velocity, and d) Change the length of rest periods, are different methods of intensifying exercises. For example:
- Increase resistance - Doing so would make muscles work harder to move the load, triggering muscle adaptation and growth.
- Increase the number of reps - This could heighten the exercise intensity by performing more repetitions than usual.
- Increase lifting velocity - This could introduce power components to the workout, changing the dynamic of muscle engagement.
- Change the length of rest periods - Altering rest periods impacts recovery and the ability of muscles to perform, which can be a method of progression in training.
All these options are aimed at making the exercise more challenging, which is essential to induce muscular hypertrophy and increase strength.