When it comes to indicators of raw strength and power, there's not much that beats the press-up. It's the only upper-body exercise you can do anytime and anywhere and is one of the greatest exercises ever invented, working all the muscles of the chest as well as the shoulders and triceps, and requiring good core strength to keep your upper body stable.Below you'll find form guides for the ten best press-up variations that require no kit, so they can be done at home, on holiday or the pub. ~ Berceste