I'am sitting in the Basement of our house right now, thinking about what I could write as a blog post and next to me Quinn works out. It is amazing what a difference it makes for her if she uses the 25lb or the 50lb weight. I'm sure she could do 15 repetitions with the 25lb on her exercise she does right now, but if it was 50lb even 5 reps would be very hard....
So why does it make such a big difference which weight she uses? --> It is Physics! The gravity on earth pulls down her weights and as bigger the mass of the weight is as grater the force which pulls it down.
Unbelievable that Physic is in every little thing we do!