Upper Body and Core Metabolism-Boosting Exercises
Supine bicycle crunches
These are the most fun abdominal exercises and are also effective for working your abdominal muscles, including your obliques, which are the sides of your core.
Starting position: Lie flat on the floor with your lower back pushing into the floor and hands behind your head. Bend your knees and lift your legs up to a 90 degree angle so your thighs are perpendicular to the floor.
Bicycle and twist: Simultaneously bring your right knee into your right armpit and extend your left leg out straight at a 45 degree angle to the floor. Rotate your torso to bring your left elbow towards your right knee. Hold this position for a moment, then alternate.