okay this might not seem like much to you all but heck with 4 days until my first sprint tri. I finally got to do 500 meters straight. Never actually had the endurance muscles wise, got pretty tired in the arms before. I ended up doing 500 meters in like 10-11 mins. But now tonights workout was a sigh of relief and makes me even more excited for my tri this weekend
Be careful not to go out too fast in your swim. I had my first Tri this March and my goal was 10 minutes. I started out 250m in about four minutes, then died for the last 250m doing 6 minutes 15 seconds, breathing every second stroke.