This thing's great, and what a deal for £4.99. I stopped doing sit ups etc koz it kills ma back, and after two days using this thing i can already see the results on my abs. You can also use it on your biceps - so it saves you doing boring bicep curls, and it can also be used on many other areas on your body. Very good purchase, and £4.99 is hardly alot of money, so whats there to loose? buy it!!!