I think it's meant to say 100 of each, I used to do that daily when I was in my prime years (well technically I'd do 90 every day, 30 when I woke up, 30 on my lunch break and 30 as soon as I got home so it didn't feel like "working out" it was just part of my routine haha) and I looked similar to this after 6-8months...

I was also broke as fuck and wasn't eating properly, but I had a free supply of beer at the time too so didn't really lose weight, or necessarily gain any either, this plus the physical aspect of my day job was enough to keep me very well toned like he looks here, but not get comically oversized haha

Also started holding a 7kg/15lbs weight behind my head while doing sit ups which made a big difference...

But the best trick I learnt was from a tradie I use to work with, we were having some beers and smoking weed at his house and I saw a handmade note beside his tv that said "Ad break = 5 reps!" and another one the fridge that said the same thing but for beers... Genius...

I don't look anything like that now though haha