One workout is to do tricep dips. Sit on a chair or bench and keep your bo th hands on both sides of the hip,flat on the bench. Keep your legs apart(about 30cm) and away from bench. Now move your back parallel to the bench up and down the floor. Repeat this workout as a set of 20 2sets and gradually increase the count to a 100.See attached pic for clarification. Wall pushups are the next: Stand a feet apart from wall,with palms on the wall,now push your upper body towards the wall and come back.(PFA pic).