Put your abs and back muscles to work with this 20-minute session. Get ready for 4 3-minute blocks of core work with some short recoveries in between. In each block you’ll be doing 3 different exercises for 30 seconds each before cycling through them again:
Block 1 – leg raises, leg raised crunches and bicycle crunches x2
Block 2 – plank knee taps, plank knee lowers with side steps and back extensions x2
Block 3 – high plank with knee drives, back raises and sky dives x2
Block 4 – side plank hip raises (left), glute bridges and side plank hip raises (right) x2.