Regular push-ups are such an effective tightener of everything waist-up: It will firm up your chest, shoulders, tighten and tone your back, flatten and strengthen your core and define your triceps. What's not to love? Well, monotony I guess.
So if push-ups are boring you, if you dread them, try them this way. The Hand Over Hand Push-Up spruces up the old favourite, adds an extra traveling challenge to the core and fine-tunes your co-ordination.
Keep it nice and tidy, no tipping or flailing around! Give it a shot.