[Slapshot]

For the first 5-7 minutes of aerobic exercise, my legs burn (quads and calves). I usually do Stairmaster but it happens on the elliptical too. I drink plenty of water beforehand, and I stretch. Like clockwork, usually around the 7 minute mark, I stop for 30-60 seconds and then start again. Once I restart the pain is gone, and I complete my workout normally.

Sometimes the discomfort is significant enough that I almost stop. But, now that I know it's temporary, I plow through it (I can do anything for 7 minutes, I tell myself).

I suspect it's lactic acid buildup. Is this caused by lactic acid? If so, any suggestions on how to avoid/reduce it? If it's not lactic, any ideas?

Thanks very much...