Characters with the Stat Combo 'Charming' can attempt to charm the trainer for a free level in Fitness. Failing to do so will make the character "just come off as creepy instead" and they will not be able to buy from the instructor.
The cost of this
This woman is decked out in sweat bands, limb warmers, and garish exercise clothes.
Only the fittest will survive in this zombie filled world! I can help you get fit, fast!
She's been continuously running in place this whole time.