I've been working out religiously for the past 6 months - Spinning, Swimming, Elliptical and weight training (I generally spend about 2 hours at the gym a day switching off exercising, but keeping heart rate between 50-85%). I have just started running, and it is KILLING me, I mean I can barley go for 1/2 mile or a mile before I am just sore and dead tired. Why is it, some days I can spend 2 hours on the elliptical, but I can only spend 5 or 10 minutes running on a different day. Is it just because it's new to me, and time will allow my muscles to adapt, or what? Any help or encouragement would be greatly appreciated.
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