If you want one of the best-kept fitness secrets, look no further than a simple bodyweight exercise: The Get-Up. There are few exercises that build as much functional strength as this one, and you can work pretty much every muscle and joint in your body in a single sequence. It's one of the best exercises to do to increase functional strength, flexibility, balance, and stability. [caption id="" align="aligncenter" width="599"] Source: thefitnesshacker.com[/caption] To do the exercise, begin by lying on your side, with your knees drawn up to your chest and your hands gripping a kettlebell. Clutch the kettlebell to your stomach as you roll onto your back, and use both hands to press upwards until your arms are extended. Place your left hand on the floor at a 45 degree angle to your body, with your right knee bent and right foot flat on the floor. Lift your right shoulder off the ground, leaning on your left elbow for support. Push up to your left hand, lift your hips, and bring your left knee beneath your body. Lift your left hand off the floor, straighten your back, and drive off your back foot to stand up straight. Reverse the entire process until you are in your original position. A brilliant exercise!