Cardio.

"I'll start off with the treadmill," Frank answered.

"It looks like you've been jogging for a while," Rachel purred, admiring his physique as they got on the treadmills. He stood at 6'4" and weighed about 230 pounds, easily towering over his slim trainer, but he started jogging to try to shed some pounds from his belly.

Frank could not keep his eyes off of her reflection in the mirror in front of them while they started with a brisk walking pace. She looked like she stepped out of one of the fitness magazine with her tone abs and legs, however, she could easily be in Maxim magazine with her large tits, wide hips, and nice round ass. She wasn't blind to his admiration and smiled back at him as she punched a button on the console. "Okay, faster."

He had difficulty trying to keep up to her pace while stealing glances at how well her sports bra prevented her breasts from bouncing wildly about.

Then he hit the emergency stop button.

"What's wrong, Frank?" Rachel wondered. "Cramp?"

"No, you're green," he grinned, pointing at her choker.