I can say that I agree with the others on the issue of Ab king pro. Maybe they haven't tried it so they think that way. I myself as an active user of Ab King Pro in about 5,6 weeks I got good abs, unfortunately for me the results could've been much greater if I dieted and did some cardio. Also one of the people that replied to this message said that he couldn't feel the burn on them, there's 2 possibilities , maybe the ab chair wasn't good or he/she didn't worked out correctly with it. With the ab king pro after 10-15 repetions you can feel a great burn and when you do the next 2,3 series with 10-15 or maybe 20 the burn will be great. The others may have a point that the ab chairs are no good, but if they haven't tried the ab-king pro they couldn't really say much about this is issue. One thing is absolutely true, dieting combined with workout and cardio is one of the greatest way to get those rock-solid six pack you always wanted.