[MENTION=459436]Slightspeed[/MENTION]'s example is instructional.

When I worked 30-40 hours and had a free schedule, I could spend enough time riding and in the gym to work the weight off. I wanted less junk because I felt better, I needed good food because my body screamed for it.

Now I work 60-70 hrs and cannot do the exercise ... some days (like today) I went in a few minutes after five a.m. and am still at work at 7 p.m.

No energy to work out today ... and even though I ate very little, because I did Nothing more physical than type, I am sure some of it will go to my waistline.

If I want lose weight now it is all diet. And most of that is discipline with post-work eating.

There is not way I can burn several hundred calories an hour by cycling--I am too overweight and too out of shape.