Here's my situation:
It's been a while since I've exercised, so I'm pretty much out of shape right now. I do take a P.E. class in school plus I walk three miles to and from school everyday. Just a few days ago I tried riding my bike to only find it much harder to do than when I used to ride my bike daily. I constantly had to get off the bike and walk for a few minutes to catch my breath and to walk off the stiffness of my legs. To top it off, I need to lose a lot of weight according to my doctor.
I do have Martial Arts training in Taekwondo, though I cannot do the same things as I used to since I haven't exercised in a while.
Now, to my question:
Is it better to build yourself up with mainly exercising before you start training again with Martial Arts? Incorporating Martial Arts training with exercising at the current moment doesn't sound like something I should do, especially since I'm out of shape, overweight, and I can injure myself.