hahaha damn I was gonna say impressive until your last sentence, maybe you have pushed it too far too quickly? It's been a very incremental process for me. When I started I did 8 to 12 pushups, and I'd try to do at least 2 sets, but now I can easily do a 100 (understand easily as an "I can do them but it's tough" haha). I rarely end my sets completely exhausted or anything, after a while it feels normal and then I increment. Some people have told me that's a wrong approach but that's because they think I want to build muscle, I don't care, I just want to have a stronger core, being tall and relatively thin that's like a must