Jason X is in the middle of his boxing workout when his girlfriend, Rebecca Volpetti, shows up to see if she can try her hand at it. Jason is game to play. He outfits her with his boxing gloves and points her at the punching bag. She's not the best at punching, but when she plants her lips on Jason's, Rebecca proves that she's an expert at other fitness activities.Pulling Rebecca close, Jason grinds his erection against her belly. Rebecca is totally on board for that! Disengaging from Jason's embrace, Rebecca drops to her knees and pulls his hardon out. She can't get enough of stroking and sucking his cock and balls, especially as Jason tugs on her ponytail to help her set the pace. Peeling her shorts off, Rebecca urges Jason to lay down so she can prove to him that her workout is way more fun than his. He obliges and she hops onto that cock to ride him. Guiding Rebecca with his big hands around her tiny waist, Jason helps her set a titty jiggling pace that hits both of their buttons.Rebecca rolls to her side and Jason spoons behind her as they change things up. That gives Rebecca the chance to show off her flexibility as she lifts one leg high and then hikes it backwards with a little help with Jason. He pounds her hard and deep, then sits her up so he can rub Rebecca's clit until she's moaning with the force of her climax.Getting to his feet, Jason pulls Rebecca up into his arms. As he holds her up, he positions her so that when he thrusts his cock he reenters her. No matter how strong Jason is, he can't keep that position up for long so Rebecca gets back on her feet and turns around until her back presses to Jason's chest. Leaning forward, Rebecca lets Jason pull both of her arms back as he fucks her from behind.Now that she is sated, Rebecca turns her attention back to Jason. Dropping to a crouch, she takes his cock and starts stroking as her mouth teases the head of his dick. That doubled pleasure is too much for Jason to bear. He grunts as he cums, hitting Rebecca's face and open mouth to leave her dripping with his love at the culmination of their sexy workout.