Look how many personal trainers are always telling people to use super slow and controlled movements with perfect form every rep, they look like nothing. Sure, it doesn’t mean you should do half or quarter reps all the time but sometimes you need to work fast and stress the muscle out towards the end of the set.
This activity is filled with drug users. Face facts. Anyone can look really good juicing unless they don't have a work ethic in the gym. Most personal trainers claim to be HIT guys so they can train their clients in 30 minutes and move on to the next while they train with volume for them self. I have seen many trainers who are juicers and like you have seen many that look like very ordinary people.