Youll Feel It Working In Just One Minute! Combines sit-ups, with the concept of the yoga plank position to kick your core into overdrive. Immediately engages your entire midsection, buns & thighs. Gives you full range of crunch motion for results you'll love. Larger Smart Monitor with Heart Rate Monitor, displays exercise duration, repetitions & calories burned. Features customisable difficulty settings for a workout to fit every fitness level.