I'v got an interesting querstion to ask. Hopefully someone who's good in the fields of biology will reply. Most people often picture a person as big and bulky when they say he's strong. I always believed that size doesn't have to do anything with strength (take a look at powerlifters), and I decided to conduct a little experiment myself. I started bench pressing a few months ago and I went from lifting 70 kg to 120 kg. I didn't take any special supplements, I didn't do any changes to my diet, nothing, I just started lifting and adding weight little by little. So, I almost doubled my chest strength and did NOT even add a single kg to my weight. I was weighing 70kg and still am. My muscles are exactly the same size So my questions are: How am I getting stronger when my muscles are not getting bigger? What exactly is happening inside? Do the muscles have limits? Will I stop increasing in strength if I don't train to get bigger muscles. (training with supplements etc..) We always hear that the human body has limits, but I don't think that's true. I increased my strength a lot in a few months, and I think that I can increase it much more if I focus on it. But, I'm no biologist, that's why I'm asking here. ;) Looking forward for your answers. Cheers.