Something you need to keep in mind and never forget is that when you exercise, you are training for life. You still may spend an hour a day in the gym, although that will still leave another 23 hours or so for your muscles to function without using any fancy equipment.
Whenever you do any type of exercise, the movement of your body during the exercise is known as the range of motion. The more difficult the range of motion is, the more effective the exercise will be, because your body has to work twice as hard to perform the movement.
Take for the instance the classic dumbbell bicep curl. If you aren’t familiar with the exercise, it is performed by standing up straight with your palms facing forward, and a pair of dumbbells held down by your sides. You’ll contract your biceps to bring the dumbbells up to your shoulder height, then repeat the exercise as many times as you wish.
Using that same movement for exercise on a bicep curl machine, you should sit down, brace your upper arms on a pad, grasp 2 handles that are in front of you, then perform the same movement as above to move the handles in an upward motion.
Now, looking at...