Burn fat and tone your midsection with this quick and effective corefocused HIIT workout. Burns about 250 calories. IG Christinesalus the shoes I train in: Complete 1 round of the following (50:10) 1) star burpees 2) tuck abs with overhead press 3) baby plank walks 4) heel clicks 5) oblique vups 6) tricep pushup burpees 7) tuck