Two great tricep exercises I do without weights.
1. Do close-handed push-ups. Place your hands so they are touching each other and then do as many push-ups as you can. Focus on using your triceps.
2. Find a bar 2 to 4 feet above the ground. Place both hands slightly narrower than shoulder-width. Then stand back so that your knees are slightly bent. Swing your body and head under the bar slowly, then extend yourself back from your starting position.

