I dont know your physical condition, but some advice:
If you are relatively new to exercise (which you're not really), start out SLOW, do only 10 mins a day, then gradually work up to an hour a day or more. Took me a yr to work up to an hr a day. Also, do it first thing in the AM when you have the most energy, drink lots of water before, during and after, and if you feel pain, take a break. Its also important to take a break (day off) every two or three days. I usually work out M-F then rest on weekends. Or you can do M, T, off W, then Th and F and off Sat and Sun.
Good luck!
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"A waist is a terrible thing to mind".