Resistance training

Stretching is not closely related to resistance training.

Resistance training is a kind of strength training in which each effort is performed against an opposing force generated by resistance. Resistance exercises develop the strength and size of skeletal muscles. Resistance training can improve overall health and well-being.

Stretching is not closely related to resistance training.

If you are referring to strength training and cardiovascular training (i.e. working out), then it depends on your goal. If your goal is weight loss, the American Council on Exercise recommends no less than 6 days per week of at least 1/2 hour of cardiovascular exercise, and 2 - 3 days per week of resistance training. Assuming you meet these bare minimum requirements, you are looking at 156.5 hours of cardiovascular training, and 52 - 78 hours of resistance training (based on 1/2 hour circuit training style resistance workouts)