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Like with the missionary position, penetration-from-behind sex engages the woman's core because she has to stabilize herself on all fours, says Berman. You'll also be working your quadriceps and glutes to help brace yourself against the impact.
However, you can use a modified position to get a good arm workout, too. Rather than having your hands flat on the bed, "if the woman has her hands on a wall in front of her and sort of uses her upper body to help thrust, that would be a good shoulder and upper body workout," Berman says.