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Who said gym couldn’t have a happy ending?

We know, it sounds really strange. But when Women’s Health asked readers if anyone had ever experienced an orgasm during a workout, women fessed up: yes, many claimed, usually when doing leg-lifting core exercises. And the notion of the COREgasm was born. “When some women exercise, the release of endorphins and dopamine, which are necessary for orgasm, combined with the tension in the abs and lower extremities, can cause the clitoral stimulation that is needed,” says sex therapist Dr Victoria Zdrok, author of The Anatomy of Pleasure.

READ MORE: “I Put On A Fitbit – Here’s Why My Life Will NEVER Be The Same Again”

Whether you experience an added surprise or not, these moves will still help flatten your tummy and give you the pelvic and core strength you need for the main event. Do one exercise after the other without rest, completing all reps of each move before moving on to the next. Once you’ve completed all exercises, rest for 30 seconds, then repeat the circuit again.

You’ll need: A bar to hang from; light dumbbells.

Hanging Straight Leg Raise

Hang from a pull-up bar with your hands shoulder-width apart and your body forming a straight line from hands to hips (A). Keeping your legs and back straight and, using a slow, controlled motion, raise your legs until they’re parallel to the floor (B). Slowly lower your legs. That’s one rep. Do four to six.

Tip: Feeling Cirque du Soleil? Try get your legs higher than 90 degrees. But don’t swing them or let momentum do the work.

Hanging Side Crunch

Hang from a bar with an overhand grip and raise your knees so your thighs and torso form a 90-degree angle (A). Pinch at your right side, curling your right hip towards your right shoulder (B). Use your core to stop yourself from swinging. Repeat on the left. That’s one rep. Do 10 to 12.

Tip: Keep your butt down as if sitting on a chair.

Too hard? Use your gym’s captain’s chair instead of the bar.

READ MORE: Put The Fun Back Into Leg Day With These 4 Moves From Pound!

Single-leg Hip Raise

Lie on your back with your knees bent and feet flat on the floor. Cross your arms over your chest. Raise your left leg so it’s parallel to your right thigh (A). Press your right foot into the floor and contract your glutes to lift your torso so your body forms a straight line from shoulders to ankle (B). Hold for three seconds, then repeat with the other leg. That’s one rep. Do 10 to 12.

Arm Pull-Over Straight-Leg Crunch

Grab a set of lightweight dumbbells and lie on your back with your arms behind you and legs extended at a 45-degree angle (A). Bring your arms over your chest and lift your shoulders off the mat while raising your legs perpendicular to the floor (B). Return to start (don’t let your legs touch the floor). That’s one rep. Do 10 to 12.

Build critical core strength with this 15-minute crop top workout. Plus: “Five things I’ve learnt since I started cycling – like how to go pantyless”

Excerpted from The Women’s Health Big Book of 15-Minute Workouts