Blast some music. Nothing gets me pumped up more than playing some Ben Harper at a most likely unhealthily loud volume. Get some good speakers (fan of the Logitech Z-10 system myself) and get lost in the melodies.
Get something done. Make some form of progress. Whatever it is doesn’t particularly matter, just kick your mind into gear by realizing that the step back was only temporary.
用音乐来放松自己。做一些力所能及的事,让自己感受到细小的成就。