Instagram fitness phenomenon Kayla Itsines didn't score sculpted arms, abs, and legs with isolation moves like bicep curls and situps. Girl cranks out total-body exercises like it's her job (well, it actually is now).
Ready to get sweaty? Follow Kayla through 15 reps of split squats to fire up those gams and get your heart pumping. Then, tackle 15 reps of snap pushups (a.k.a your ticket to the gun show) followed by 15 bent + straight leg raises to seriously strengthen your core.
Trust: You're going to feel (and see) this everywhere.