RECOMMENDATION

The guidelines of the ACSM (American College of Sports Medicine, one of the best schools of sports medicine in the world), suggests:

Adults should engage in moderate-Intensity physical activities for at least 30 minutes on 5 or more days of the week. According to the Centers for Disease Control and Prevention (CDC)/ American College of Sports Medicine (ACSM). Moderate-Intensity is any activity that burns 3.5-7 kcal/min

ACSM recommends that adults participate in RESISTANCE TRAINING 2-3 times per week.

ACSM's FLEXIBILITY TRAINING guidelines recommend that stretching should be performed a MINIMUM of 2-3 times days per week, ideally 5-7 days per week. 

An exercise frequency of more than 5 days per week generally is used for athletic performance enhancement or WEIGHT LOSS.

For weight loss the frequency should be 5-7 days/week,  30-60 min. day to total 150 min. per week, progressing to 300 min. per week, of moderate physical activity; 150 min. of vigorous physical activity. For weight loss, is best attained through a combination of DIET and AEROBIC EXERCISE.

REFERENCE:

ACSM- American College of Sports Medicine.