A couple of thoughts:

1. Any exercise done just for "fitness" and "to get in shape" is ultimately doomed to failure. You say you have not been exercising for two years? There must be a reason why. Did you not enjoy your previous exercises? Were they sort of forced, something you did to "keep in shape?" Ultimately, for one reason or another, the program failed, as you admit that you haven't done anything in two years. Which brings me to my point: You must exercise at something you enjoy and love doing. Bicycling, tennis, walking, running - it really does not matter as long as it is something you LIKE TO DO. Not something you force yourself to do.

2. So, what do you enjoy doing physcally? Perhaps you don't really know? One thing I would do is to try different activities (and give each one a chance - it takes a while to get to the good part in most physical programs). One of those could be biking - but prehaps not. I hope my point comes across okay and I don't mean to be preachy.

As for me, I love: walking, hiking, biking, weight lifting, and enjoy swimming.

I hate: running, competitive sports (baseball, soccer, etc.) with a lot a "rah rah, you must be able to do better" stuff. Drives me nuts!!

And I love to bike alone or with my wife, and the same with hiking and walking and weight lifting. Setting my own goals and achieving them is what I enjoy.

BUT, there are many who love the "rah rah" of competitive sports. Find what YOU LIKE and make that your activity. Once you enjoy it, the "training" part will come easily and naturally. In fact, if you enjoy it, you don't even think about training - you want to do the activity so much, that you just naturally get fit.

Sorry to be so pedantic. It is just that this is exactly what works for me, and I see so many neighbors and friends who fail at physical activity because they force themselves into doing things that are non-enjoyable.

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