‘Learn from the mistakes of others, you can’t live long enough to make them all yourself.’ Eleanor Roosevelt
What have you learned from your training mistakes? Hopefully we can learn something from each other’s cock-ups.
I’ll go first.
Don’t overdo the heavy tricep extensions, you WILL get tricep tendinitis.
Don’t chase weight on smith machine squats. The smith machine has plenty of practical uses, heavy squatting is not one of them.