More exercise better in long run, study finds

Paul Williams has only run one marathon in his life, but by his own research, he could probably benefit from running a few more.

A scientist at Lawrence Berkeley National Laboratory, Williams has put together the world’s largest study on runners, and the evidence found over 20 years of research points to an important conclusion: When it comes to exercise, more is almost always better.

"When I started my study, everybody sort of knew exercise was beneficial. The government was saying you get benefits by walking three or four times a week. My data has shown the more you do, the greater the benefits," Williams said. "I’ve had people doing 100 miles a week of running, and you could see benefits up to that level."

Erin Allday, Chronicle Staff Writer

Full Story: http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2010/02/01/MNFC1BID8F.DTL