When I was 13 I started training abs (sit ups), first I did 60 one day, 2 series of 30 and started from there. From there my progresion multiplied, started doing 120, 250, 500 and so on but I did this once or twice a week. Also I was a little underweight. (male)
Is it normal for abs training to progress that much?
When 14, I did my personal record of 1000 in 2 hours (not sure about the time). Right now I am 15 and would like to know if this was excesive, other than the common issue of hurting my lower back. My abs usually didn't hurt, only my back which hit the floor with a thin yoga mat too many times.
Was it excesive? Should I do it again?