ET has an exclusive look at Tuesday's episode, in which Kenny (Noah Galvin) and his mom, Eileen (Martha Plimpton), hit the gym -- O'Neal style.
"Oh! They have a monthly unlimited plan! Do you think we should just go ahead and sign up for that right now?" a clearly entranced Kenny asks his mom as they enter the gym for the first time.
"No way! They're always a rip-off. Plus, we haven't even seen what it's like yet," Eileen reasons.
"I'm pretty sure I know what it's going to be like," Kenny replies as he enters the gym of his fantasy... eerily similar to the music video for Olivia Newton-John's "Let's Get Physical." Yup -- '80s garb and shirtless men included.
Needless to say, Kenny quickly snaps back to reality.