Push ups are the ultimate ab workouts for 6 pack without equipment. It is the perfect exercise for toned arms and strong core. The normal kind of push ups will help you to strengthen your muscles. It may be a little difficult at first, to gain balance. It is better to practice push-ups by balancing on your hands and knees (not hands and toes). -Push ups-
First start off with knee push-ups and then you can go in for the normal ones. This exercise will strengthen your muscles and tone them to the maximum. Do 3 sets of 10 reps every day, to get the best results. This is a very effective muscle building exercise, do try it out.