Strength training exercise is an activity that involves using resistance to build muscle and increase strength. It can be done with weights, machines, or bodyweight exercises such as push-ups and squats. It is a popular form of exercise for athletes and those looking to improve their physical fitness. The ROW, which is a three letter word, is an exercise that uses a rowing machine to work the back, arms, and legs. It is a great way to build strength and endurance.