Hi, Delbizz, and welcome to our team!
I have chronic back issues to deal with and am inclined to think there are a few things for you to consider:
1) You may be pushing too hard too soon. You need to condition your body to sustain the higher exertion level from running. Start out slowly with a 5-minute warmup before you pick up the pace into a slow jog. Over time, you will build strength and endurance, and be able to add distance a little at a time.
2) Posture and form are important. Loosen up by shaking out any tension prior to your workout. Relax your shoulders, maintain good posture, try to run lightly on your feet. Keep your pelvis tucked, breathe into your abdomen with a regular cadence. Keep your arms bent at a 90-degree angle and moving forward (not across your chest). Your feet should be pointing forward to not torque your knees.
3) Core strength is super important. There are exercises to improve lower back strength. Pilates is particularly beneficial. Learn runner's stretches to help your recovery post-workout, as well.
4) Cross-training, especially swimming, is a great way to help maintain conditioning without the impact. Cycling, or spinning, is also great for your legs without impact.
Sure, carrying around extra weight is a contributing factor. However, there are plenty of large-size runners out there who have learned to properly condition their bodies for running.
Congratulations for beginning your new running lifestyle!
"Life is like a banquet, and most poor suckers are starving to death." Auntie Mame
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