14. Trainers can feel you
Of course, gyms are full of sweaty and smelly people. But when you work closely with a trainer, it's hard not to notice the stench that comes off the shirt you've worn during the last 3 sessions without washing. Treat your trainer (not to mention your skin) and wear a clean shirt for each session. If you can not use it every time, touch at least one deodorant before training.
followingYou are never too old to learn new stuff.