Tone your midsection muscles in this 20-minute core workout. In this session you’ll be targeting your abdominals and obliques with a mixture of strength exercises to increase your balance and stability. You’ll run through the exercises in each block twice, and spending 40 seconds on each exercise:

Block 1 – inchworms, plank leg raises, and slow mountain climbers
Block 2 – zombie sit-ups, double-footed floor taps, and Russian twists
Block 3 – toe reaches, tuck-ins, and half boat holds
Block 4 – window wipers and side-lying double leg raises.