consider push ups too.. amazing how much that will help.. your pecs with tighten up. your lats will spread like the hood of a cobra.. and your triceps will get well defined.. in no time.. I do them every morning with my stretches and crunches... it's a good way to start until you find your way into a regular weight routine where you can get a balanced program ... don't avoid the legs.. remember you can't shoot a cannon from a canoe.. you will appreciate the gains in below the waist strength too ..