Activities Sports & Athletics How to Build Up Your Swim Training Distance Share PINTEREST Email Print Getty Images Sports & Athletics Swimming & Diving Technique Gear Workouts Health & Safety Diving Baseball Basketball Bicycling Billiards Bodybuilding Bowling Boxing Car Racing Cheerleading Cricket Extreme Sports Football Golf Gymnastics Ice Hockey Martial Arts Professional Wrestling Skateboarding Skating Paintball Soccer Table Tennis Tennis Track & Field Volleyball Other Activities Learn More By Mat Luebbers Mat Luebbers is head coach and program director for the Marine Corps Community Services' Okinawa Dolphins Swim Team in Japan. He has a master's degree in sports science. our editorial process Mat Luebbers Updated April 22, 2017 How do does a person determine what distance to workout depending on the swim distance of the race? For example, how can I determine the distance that I need to workout if I plan to swim a 3 mile (~5 km) open water swimming race? There is no specific formula I use for training plan distance to train vs. race distance other than being sure to swim the distance of the race over the course of one or two workouts each week. For a 3-mile race, I'd try to have at least one workout every other week that was that long or longer, and I'd be sure that at least two workouts during the other weeks were 50% to 75% of that distance. More important to me is the intensity of the workouts, or how fast you are trying to swim. I would try to build up to doing sets of swims (intervals with rest) at the goal race pace. Maybe build up to doing 6 x ~1/2-mile swims, starting each slower than goal pace and ending each at or faster than goal pace, with some rest (30-seconds to 2-minutes) between each swim. I might include progressions like this for one workout each week over a period of many weeks, depending upon where my fitness was when I started (the workout would still include warm-up, cool-down, some technique work, etc.). I would either try to start each swim slower than race pace and end each swim faster (build each swim), or I would try to do each swim faster than the one before it (descend the set). I would take 30-seconds to 1-minute rest between each swim Week 1: 2-3 x 500 with 30-60 seconds rest between eachWeek 2: 1-2 x 1000 with 30-120 seconds rest between eachWeek 3: 3-4 x 500 with 30-60 seconds rest between eachWeek 4: 2-3 x 1000 with 30-120 seconds rest between eachWeek 5: 4-5 x 500 with 30-60 seconds rest between eachWeek 6: 3-4 x 1000 with 30-120 seconds rest between eachWeek 7: 5-6 x 500 with 30-60 seconds rest between eachWeek 8: 4-5 x 1000 with 30-120 seconds rest between eachWeek 9: 6-7 x 500 with 30-60 seconds rest between eachWeek 10 5-6 x 1000 with 30-120 seconds rest between eachWeek 11: 7-8 x 500 with 30-60 seconds rest between eachWeek 12: 6 x 1000 with 30-120 seconds rest between each I would probably also include a longer swim during one of the other workouts during the week. After the warm-up, a single, straight, non-stop swim, less worried about speed/pace and more focused on good technique and keeping a steady effort. I might try to get faster toward the end of the swim, or I might throw in faster 50s or 100s throughout the swim. I would aim to do a full, non-stop, three-mile swim by week 7, and repeat it during week 9 and 11. Remember to do swim technique work as often as you can, too. It should be a part of every swim workout. It could be as little as 3 or 4 x 50 of stroke drills - even that little bit could make the difference over the long haul. I hope that helps with your open water swimming workout. Let me know how things go or if you have more questions.