Ever wonder how Ciara sculpted her incredible arms or how Khloe Kardashian maintains that killer booty? His name is Gunnar Peterson and his workouts mean business.The man is a wizard when it comes to getting stars ready for movie sets and cover shoots, so it’s a no-brainer as to why you’d want his advice, too. No doubt his methods could whip your soon-to-be summer bod into shape, so keep scrolling for three core arm and back-targeting exercises you can pull off at the gym.BICEPS: BICEPS CURL WITH LUNGE

ESC: Gunnar Peterson

Kailey Strachan for E!

Targets: “Biceps on the upper arm and glutes.”Reps: “Between 8-20, per side, depending on the weight you have available and your current level of fitness.”Results: “A more fully-developed and balanced upper arm, a more impressive ‘show me your muscle’ pose and more shapely glutes.”

CHEST: PUSH UP T-RAISE

ESC: Gunnar Peterson

Kailey Strachan for E!

Targets: “Your pecs, your triceps, your rear shoulder head and your core. Sorry, no glutes.”Reps: “10-16 TOTAL. 16 so you’re balanced, otherwise I’d leave it at 15.”Results: “Improved core stability, triceps with less droop, pecs that pop and friends who are impressed with your newly developed ability.”

BACK: SQUAT ROW

ESC: Gunnar Peterson

Kailey Strachan for E!

Targets: “Muscles of the upper back and of course, glutes.”Reps: “8-12, per side, depending on the weight you have available and your current level of fitness.”Results: “Improved posture, improved topography in the musculature of your upper back and better glute development.”

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