Is there any aspect of your training that you regret?

Is there any aspect of your training that you regret?

I regret not doing deadlifts from the start of my training, tried to teach myself on a smith, injured my back and decided they weren't for me, only started back doing them in october i think and can now do 130 for reps which i'm quite happy about, though it annoys me to think what i could be able to do if i learnt them right in the first place...