Explain the exercise prescription recommendations for a basic flexibility program.

Per recommendations from the ACSM,minimal frequency should be 2-3 days per week;intensity of the stretch should be to the point of slight tension of mild tightness;each stretch should be held for 15-60 seconds with four or more repetitions of each stretch;and stretches should be done for each of the major muscle groups or joints,including the neck,shoulders,upper and lower back,pelvis,hips,and legs.