How can I relieve some soreness from yesterday's basketball workout?

Several modalities have been shown to have some effect on decreasing muscle soreness. Foam-rolling, stretching, and a proper warm-up before you play will improve your mechanics and decrease the stress placed on your muscles, tendons, and ligaments. This leads to less tissue damage and less soreness. Stretching and foam rolling after you play will decrease the muscle hyperactivity and tightness associated with exercise, which can cause discomfort in the days that follow. Light activity, or recovery training can improve the circulation and removal of post-exercise waste products in muscle tissue. Light activity also increases the extensibility of tight, hyperactive muscles. A warm bath and/or cold packs can reduce muscle activity and pain in sore muscles.  If you notice acute (localized to one small area) pain and swelling, it is wise to consult your physician. Acute pain and swelling can be a sign of tissue damage that may require treatment from a physician. Last, if you are sore for more than 3 or 4 days, you worked out too hard. Overtraining can have serious consequences that may affect your athletic performance permanently.