I'd say use your body as the weight that way you won't injure yourself.
Push ups ,sit ups, pull ups, static excercises, lie down keep your legs straight and raise them both to 45 degrees (continuous reps).
Change the rythm of the push ups fast reps mixed with real slow ones.
Also try different varieties of push ups, sit ups and pull ups to work out different muscles of the body.
Strengthen forearms and the body's core.
You will look like bruce lee in no time
Push ups ,sit ups, pull ups, static excercises, lie down keep your legs straight and raise them both to 45 degrees (continuous reps).
Change the rythm of the push ups fast reps mixed with real slow ones.
Also try different varieties of push ups, sit ups and pull ups to work out different muscles of the body.
Strengthen forearms and the body's core.
You will look like bruce lee in no time