Sculpt your biceps and target your abs with this fun variation of boat pose.
How to do it: Grab a pair of dumbbells and sit with knees bent and feet lifted off the floor. Brace your abs in tight and lift both feet up until they're in line with your knees. Keeping your chest up, hinge back slightly as you reach your legs away from your torso and lower arms to the floor. Sit up, drawing your knees in closer to your chest as arms curl in. Repeat for 1 minute.
Keeping the back straight during this move is key to protecting your spine and fully engaging your abs. If it's too challenging, place your feet on the floor at any time to make it easier to maintain a straight spine.