I was learning 3 guys who were about 17 years old some basic exercises yesterday like squat, deadlift, bent-over bb row, militarypress, chins, bench and I was pretty shocked how weak and uncoordinated they were.
I'm gonna talk about one of the guys because the two others gave up after two exercises and went to do some abzzz :). I first loaded up the bb to 40kg 90pounds and he couldn't even do 1 rep so I had to lower the weight 30 kg 65 pounds and those didn't have really full ROM and no controll. He had difficulties to control his spine being in a arch or bent so I had much difficulties to teach him to deadlift. However chest up seemed to do the trick so he could do decent deadlifts.
He doesn't have bad genetics he told me his dad have had a 180-190kg bench 405pounds and 52cm arms 20.5" when he was 25-26 years old. I think it has to do with a lot of young people don't do any sports or other physical activities in their younger years.
I was always active in sports atleast 3-4 times per week until I started lifting. I could lift 20kg db's when I started and was pretty quickly up to 25-27.5 which isn't great but still I had control
I'm curious to find out how weak/uncoordinated you were when you started to lift and how much sport's you had done in your younger years. Also other thoughts on this subjects are welcomed:)