Russian Twist vs Back Extension

Pull Ups Push Ups Dips Chin Ups Bodyweight Squat Sit Ups Handstand Push Ups Crunches Back Extension One Arm Push Ups Pistol Squat Diamond Push Ups Single Leg Squat Muscle Ups Glute Bridge Lunge Burpees Neutral Grip Pull Ups Hanging Leg Raise Glute Ham Raise Bench Dips One Arm Pull Ups Lying Leg Raise Inverted Row Hanging Knee Raise Australian Pull Ups Ring Muscle Ups Reverse Lunge Toes To Bar Star Jump Squat Thrust Squat Jump Side Lunge Side Crunch Roman Chair Side Bend Pike Push Up Mountain Climbers Leg Lift Jumping Jack Jump Squat Incline Push Up Incline Bench Sit Up Hip Extension Flutter Kick Floor Hip Extension Floor Hip Abduction Decline Push Up Decline Crunch Clap Pull Up Bicycle Crunch Sissy Squat Close Grip Push Up Nordic Hamstring Curl Reverse Crunches Ring Dips