CrossFit Games Hopper 2007

Hopper workout from the 2007 CrossFit Games

When i run my legs get sore like i have been running up stairs, but when i stop running it goes away?

I play soccer, but i dont notice it during games. And it’s not sore after i run just while i am running. I get it when do laps. It never happened to before because in the beginning when i started running, i just ran out of breath, and then i didnt run out breath and my legs were fine, now my legs kill. WHat’s wrong with them?

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