running

[green]

so im kind of overweight and i had to do the beep test today and i only got to 5.3. now i can ride my bike 20km and be kind of tired but thats continuosly not stopping. I ride my bike to and from school which is 7km each way. Why havent my legs strengthed to wear i can run long distance without stopping? How can i work up to doing 10km.

[Elenin]

Biking and running are 2 different sports. You have to work UP to running 10K. You can strengthen your legs all you want, but you probably won't see a modest increase in your running ability. Take it slowly since you're overweight and semi-active. Biking is considered a cross training activity. Try following the Couch-to-5K program http://www.coolrunning.com/engine/2/2_3/181.shtml followed by a 10 K program like this one http://www.coolrunning.com/engine/2/2_4/138.shtml and you should be well on your way to running 6 miles! Runnersworld.com is a good website if you need some more tips. Work with your body and don't go the 'extra mile' if you don't have to.