Lying Tricep Dip
A good exercise for the triceps which can be performed with no equipment.
Sit on the floor, with your legs bent, both hands just behind your buttocks, palms facing forward. You may decide to adopt a number of different hand positions, which could include normal shoulder width - wide arm or hands close together (thumbs touching).
Starting with your arms, slightly bent, lower your body downwards, controlling the lowering and lifting movements with the use of your tricep muscles.
Focus on taking the elbows back, rather then letting your arms go out to the side, as this will work the muscle of your chest, rather than your triceps.
Make the movements smooth and controlled, holding in the lower phase for 1 - 3 seconds prior to lifting your body up, with minimal assistance from your abdominal muscles.
This exercise can be made harder by lifting your feet off the floor, as this will also work the abdominal muscles.