Mint 3 I tried to use this exercise machine to make up for not being able to go to the gym during Coronavirus pandemic. The product came in a box with a simple instruction on how to assemble, but no indication of how to use it properly to get the desired effect of exercise on your stomach...the model woman in the picture on the parcel makes it look as if it's really easy with a wonderful smile on her face while she does the sit-ups, but the position of my head and the arm-lengths probably are not right for this and it keeps sliding every time I wake up from the floor. Wish there was an adjustment hole to match my height.