Including flexibility training (stretching) in your workouts is crucial to round out the training program. However, many athletes neglect to make the time for it. Research shows static stretching at the beginning of your workout may hold back physique performance. Static stretching has benefits, including improved flexibility and posture. However, this type of stretching is best done at the end of your workout during cool-down when your muscles warm and pliable. Begin training sessions by warming up with dynamic stretching. Active-range-of-movements that lengthen the fascia (connective tissue around the muscles) raise your core body temperature, and prepare your body for the exercises to come in the workout.