My two cents, is to make sure you start with non-impact aerobics like pool running, proceeding through spinning, ellipticals, and rebounders, until sufficient tone has built up in the muscles you plan to use, using the type of muscle fibers that will eventually be doing the work. A lot of strength-building exercises do not train enough of the right muscle fibers. On the other hand, wobble-boarding at slower speeds will be helpful.
Your running muscles include slow-twitch, fast-twitch, and super-fast twitch (white) muscle fibers, which are not all trained by most exercises. Just training the muscle you plan to use is not the same as training the FIBERS you plan to use. Aim your training program toward faster, more vigorous work after you have spent sufficient time gauging your recovery. By all means ramp up slowly, but make sure the eventual destination involves enough speed to exhaust you, before you make plans to hit the road. This will alter your hormonal response for maximum muscle growth, which is what you need most after all that down time and atrophy. Then, when you are ready for pavement, you will truly hit the ground running.
An example would be a few minutes of warm up followed by 10 minute sets of 30 second speed intervals followed by 90 second recoveries, done at an intensity that produces heavy breathing. Work your way up to 20 minute sets 2-3 times a week with plenty of time left to remodel your recovering muscles.This kind of workout gives you maximum results with maximum recovery time.
If I were you, I would not hit the actual road until September, after at least two months building up to your first run. When you start running again, start as if you were a new runner. Add no more than a mile or two a week until the end of the year. The rule of thumb for athletic recovery is two months recovery for every month down, before you reach the level you were at when you stopped. When I took six months off for an injury, it was more than a year before my 5k times were close to pre-accident levels. Don't lose patience with the process. You will continue to improve, just like when you started running. Following the advice above should speed things up as much as possible.
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