Sexy Summer Abs Workout Planks, side plank lifts, knee hugs and a whole lot more to get those abs on fire! In between reps on the knee hugs try not to let your feet touch the ground; this will make it even harder and work your lower back as well
Get it done in seven minutes a day. This 7 minute HIIT body weight workout does more than just scorching calories during the session, but long hours after. Plus you get both cardio and strength training at the same time.