Suggest Remedy For Cramps

started spinning(cycling) at the gym vigorously in the past month or two...for the past week or so been having strong cramping in both quads, sometimes one sometimes both...although the first cramps were when i was spinning, its been 10 days since my last spin class and the cramping is actually worse...days only, when im walking, intermittent but they are sore...male 40, 6 175