3. Pull-ups

Pull-ups are probably the most challenging because you are basically pulling your entire bodyweight up as high as you can. While push-ups focus more on the chest and tricep muscles, pull-ups hit more of your back and biceps. For an easier variation of a pull-up, grab onto a bar that is about as high as your belly button, lie underneath it and pull your chest up to the bar and then lower back down. This is a great starting point before tackling real pull-ups.