Promo:

Thor, a new boy at the gym, watches partners Pete and Steve finish their workout, His growing shaft aching for a fuck, Thor follows them to the locker room to make out. As he buries his tool between the cheeks of Steve's ass, Pete tongues the rest of Steve's body to a magnificent climax.

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See Magnum Griffin Magazine 1: Heavyweights

Promo:

Two blonde beauties, Thor and Freddie set the pace for this sex capade in the hot tub. When dark-haired Tony, the towel boy, joins them, the action speeds up. It's a game of musical chairs, in and out of the tub, rimming, sucking, fucking. A wild 3-way to everyone's delight!

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See Magnum Griffin Magazine 2: Double Header

Promo:

When instructor Eric strips down to show David and Jamie the proper way to use gym equipment, he becomes more interested in their equipment. The boys, also eager to play games, mount Eric in outrageous positions on the exercise machine, blowing and screwing each other until the love juices flow.

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[See picture magazine Magnum Griffin 3: Bench Press.]

[A Manshots article placed the release at about 1977.]

The beginning of this loops has Tim doing some very graceful gymnastic floor exercises in his jockstrap.

Promo:

Three young bodies on a gym mat building their muscles. Watching each other exercise, the mood soon changes from work to play. A frenzy of sensuous lips around stiff dicks and lunging cocks up pink assholes dazzle your eyes as Tim is caught between David and Steve in a gratifying triple header.

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See Magnum Griffin Magazine 5: Training for Lust