What are recommended exercises to do at the gym that will help ease my low back pain?

Stretching: Stretching, core strenghtening, yoga and pilates all will be helpful.

Back pain in young: Young patients rarely need further evaluation for back pain as it is usually self-limiting. For mild symptoms, muscle pains are most common. Consider also disc degeneration which is the rule not exception. If symptoms persist. Core strength is a start: pilates/yoga/piyo, nsaid's, salonpas hot patches. Mckenzie pt if no better but requires a doc's rx.