Im 135 5’10 and got a 6 pack. Its worth doing. I do crunches every other day. I do 90, 95, then 100 crunches. I dont even feel sore anymore. When I first started I used to do a minute of lifting my legs a few inches from the floor for 1 minute 4 times then ending with a 2 minute lift. Its really tiring and I got a 6 pack from it, I heard that crunches are better so I switched to crunches.