Two weeks wouldn't be that long off the bike for me. I don't ride in the winter anymore, so I'm off the bike up to five months every year. When you get back on the bike after not riding for a while, maybe you could take it a little slower to start with. Maybe go a little easier on the pumping, and shorter combos. Or work on tricks that use different muscles.
It is very important to stay hydrated, drink lots of water. Muscles can cramp up after long sessions if you are getting dehydrated. Do leg stretches, especially after riding.