A 7-minute, high-intensity/interval workout: http://goo.gl/hQFvr Might have to give this a try one of these seven minutes.
@DavidAngotti haven't signed up for any yet, but trying to make up my mind about whether to do the SF marathon again.
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@DavidAngotti haven't signed up for any yet, but trying to make up my mind about whether to do the SF marathon again.