Hi Steve, If you have only been running since Sunday and you've already covered 4/5 miles, at 6ft and 19st i would say you've overdone it by quite some distance. I really don't think you should have covered that sort of mileage in your first three days of running and it would explain all your pain in my opinion.
Are you following a plan of any sort? Do you take walk breaks?
There are plenty of beginner plans out there to follow and seeing as you have until Septemebr theres really no rush. Ease into it, and don't push it too hard to start with.
Why not try this beginners schedule -
It'll have you running 30 minutes non stop in 8 weeks, then you could follow a beginners half marathon plan?
Like this -
[u]Beginners Half Marathon Schedule[/u]
The shoulder tension might be sorted out by relaxing more. When you're running, make sure you're not gritting your teeth, making white-knuckle fists or pumping your arms to drag you along - try to let them swing loosely and take up the rhythm that is natural to them.
The back pain is a harder one to crack. As a big lad, make sure you've been to a proper running shop and got advice on shoes. They'll likely be expensive, but it's worth it to not do damage to your body.
Other things you can try are to make sure you're not smashing each step into the pavement. Try not to push down into the ground to propel yourself. Make sure you loosen up and warm-up / cool-down at the start and end of your run. This just involves not setting out at full-pelt and then slowly jogging the last half mile or so. You might like to research some stretches you can do after a run while your muscles are still warm. Doing exercises such as planks and bridges will help build up your core stabiliser muscles: you're not just using your legs to absorb the force when you run.
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