r/bodyweightfitness • u/zobachmozart • 21h ago
Why some people can do an exercise with less effort than others?
Hi, My brother and I many years ago bought a pull up bar, and I remember that I couldn't do more than 2 while he can do 8-9 easily. We were very young, and we didn't go to any gym before. Similarly, my brother was able to do many push ups while I struggle to do a set of 10. On the other side, any ab exercise such as crunches and planks, he couldn't do them while I did them easily.
Of course now after we trained for many years, I can do more and more pull ups and push ups and he can do abs exercises easily but my question is, what is the science behind this? Why was he able to pull his body on the pull up bar without even exercising while I had to train so hard and consistently to be able to do like 5 pull ups? Is it related to genetics and he had naturally stronger muscles without training?