This is a false statement. There is a big difference between feeling the burn and feeling pain, if you are feeling pain it could mean that you have pulled a muscle and you should stop and consult your doctor, also if you are feeling back pain that means you maybe pinched a nerve or slipped the disc. Lastly, other signs pain you should look for is ankle pain and feeling lightheaded because ankle pain could indicate a sprain and lightheaded can indicate that you are either overworked yourself or you are not getting enough water consumption.
In a professional environment, incorrect language could affect your profession.
31 lbs or 24% i hope this is correct if not send me a message and ill try to get it right oWo
I would say, trunk flexion uses the most amount flexibility.