How to Lose Weight on a Bike

I tried to lean forward on the what bike, because it's got the little elbow or forearm pads, doesn't it, where you just lean forward? And I'm thinking that's what the pros do. So being an ex-robi player in pro, you think, I'm going to do what they do. But the cyclists, I've lent forward, tried to cycle. My belly wouldn't just get down there. He says he can put on three kilos in a weekend for eating and drinking - which he probably can. "It's a lot to get three kilos off... but I'm enjoying the what bike"