First of all, you need a Kettlebel. Next，we wiil introduce some methods to you about training muscle.
The first one, Halo, How to: Start standing with feet hip-width apart holding the handle of a kettlebell with both hands in front of face, elbows bent and wide at sides. Keeping both elbows bent, and the rest of body still, slowly circle the kettlebell around head once, keeping the weight at eye level. That's one rep.
The next one,Single-Arm Kettlebell Push Press, How to: Start standing with feet just wider than hips, a kettlebell in right hand, right arm bent with elbow close to body so that the weight rests on shoulder, and left hand on hip. Sink hips slightly into a quarter-squat. Then, quickly push through feet to extend legs, simultaneously pressing kettlebell straight up until right arm is completely extended overhead. With control, lower kettlebell back down. That's one rep.
The last one,Half-Kneeling Windmill, How to: Start by kneeling on your left knee, and bring your right foot to the side of your body, with foot firmly on the ground and toes pointed to the right. Hold a kettlebell in your right hand. Rack the kettlebell at your chest, then lift it overhead, keeping your eyes on the weight. Slowly lower your body down until your left hand reaches the ground. Then continue lowering until your elbow and forearm reach the ground. Reverse the movement and return to start. That's one rep.
If you want to have perfect abs, hurry up and act！