Keto Rapid Max Pure Lie on your back and do a set of ten perfect crunches. Then without Slim Belly any rest do a set of ten reverse crunches. Turn over on your stomach and hold a plank for 10 seconds. By now you might need a breather, so take a thirty seconds break and a sip of water. Then lie down on your side and hold a side plank for ten seconds. Switch to your other side and hold a plank for ten seconds.