mate, I don't think you need to go to classes and stuff like that - it becomes time consuming and you will end up not going, or getting bored and pissed off with too much time wasting etc.<br />
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SImple, just stretch, stretch, and stretch some more. While watching TV, get on the floor and stretch, after training while you are nice and warm, lots of stretching. When cold stretching though don't bounce the stretch, just extend it.<br />
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You should be back up to pace really quickly, it does not take long to get the flexibility back.<br />
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This coming from a bloke that has always been fortunate enough to be very flexible with no work on it. BUt when I do extra stretches, it does not take long to increase that range of motion.