Foster, last season's rushing champion, tweaked his left hamstring in last night's 49ers-Texans preseason game. He hurt the same hamstring earlier in camp. He appreciates your concern about his semitendinosus, unless you are concerned simply because of your fantasy team.

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Foster tweets:

4 those sincerely concerned, I'm doing ok & plan 2 B back by opening day. 4 those worried abt your fantasy team, u ppl are sick

Yes, Arian, they're sick. They have fevers. And the only prescription is more all-purpose yards. Get to it.

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Arian Foster [Twitter]