The best exercise for race preparation is to take everything off the boat, give it a good cleaning and return the safety equipment and only necessary gear. Although we never use our head, I found it half full of water one day. Sometimes water gets in through the breather tube or it also can drip in if the fore hatch leaks. Other than a dry head and batteries, nothing should be in the forward compartment while racing. Crawl back on the quarter berths and check the inside of the transom.
Water sometimes gets trapped aft of the bulkhead.
I sponged a good bucket full out of there before I tightened the cockpit drains. Before a race and after, sponge out any water in the bilge and under the berths on each side. Make sure the cushions are dry. Ensure your crew exercise restraint when packing for a day of racing. This is relatively easy on a K-25.