Rex G

Bicycling does not exercise muscles in a balanced way, as the lower back muscles are exercised more than the abs, and the oblique muscles, which are the abs that twist the torso, get almost no exercise. So, to have flat ab muscles, do ab exercises.

Then, there is the fat factor. The argument about spot reducing can go on all day, but I don't buy it. Keep in mind that one can have a beautifully toned six pack of ab muscles under a thick pad of fat. Consuming more calories that one uses will cause fat to be deposited; those deposits will occur where one's genetics have predisposed it will occur, and the first place one tends to gain fat is the last place from which it will depart. For many of us, that is the belly.