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With a standard cowgirl position, the lower part of the woman's legs are braced on the bed or floor, which will engage her butt and core.
"Much like riding a horse, she's going to flex her lower abs and pelvic muscles," says Yvonne K. Fulbright, a certified sex educator and author of Touch Me There! "Pressing into the man's abs and sides with her quads or calves can engage those muscles as well."
Modifying the cowgirl position can work additional muscle groups. "To make it even more intense, she can come up onto her feet, almost like a squat over him. That's all butt, legs, and hips," says Berman. "If she gets up onto her feet and leans onto her hands, she'll also have to use her upper body to balance."