Seven years ago I tried to run. I weighed 265 pounds and my doctor suggested the activity might help me lose weight. I gave it up after 2 weeks feeling I had no stamina.
When I turned 30 I joined a gym between weight training and indoor cardio I lost most of the extra weight and toned up. Now at 230 pounds I thought I'd try running again. To my surprise I loved it. The first day I ran 5km, a few days later I upped it to 7km - within a week I found that the toning from the past years at the gym allowed me to run with great endurance and stamina. On Sundays I started running 15km in the country and couldn't wait for the next Sunday - I was trying to give myself time to rest so I would run 7k, 7k and 15k with a day in between. I find my stamina would let me go longer as would my cardio levels. But I seem to have nothing but problems with the rest of my body.
Now every time I try to go for a run my left calf muscle starts to cramp. Or I get a twinge in the ligament on the outside of my knee. I realize I've overdone it and would like to figure out what I should do to rehab these injuries and strengthen the necessary muscles and joints to allow my limbs to do what the rest of my body wants.
Any suggestions on a better approach that might open the door to extended distance running for me?
Sounds like too much, too soon. Your heart and lungs may well be able to take the stress of running 7 - 15K, but your joints and muscles need time to acclimate to the stresses of running. Keep in mind that when with each footfall when running you are putting between 3-4 times your body weight of pressure on your feet, ankles, knees and hips. You need to back off a bit, let your calf heal. You may be developing some ITB issues as well. Get the trainers at you gym to show you some stretches.
I just pulled a calf muscle a couple of weeks ago and my doc had me back off running completely for a week, then try a slow 1 mile run. Had to stop if I felt any pain. He wouldn't let me do more than that until I could do it without pain, then a day off before trying another mile run, then gradually add the miles back on. Mind you, this was after I already had a good base of a couple of hundred miles in and with a half-marathon race coming up 5 weeks after the injury. You shuold start back up with low mileage runs and only increase about 10% per week on both total mileage and the length of any individual run. It is frustrating, especially if you are fit, but the alternative - as you are finding out - is injury.