Today, I swam 500 yards in 7 minutes 15 seconds and 550 yards (500 meters) in 7:44 in a 25 yard pool.
My pool swim workout:
Warm Up
200 swim, 200 kick, 200 drill (100 catch-up, 100 fingertip drag), 200 swim
Pre Set
6 x 50's freestyle build on a 1:00
1) 70% effort
2) 80% effort
3) 90% effort
4) 75% effort
5) 85% effort
6) 95% effort
Main Set
2 x 500's with 1:00 rest between each 500.
Cool Down
200 slow & easy
This workout is designed to prepare a swimmer to pass the USLA lifeguard swim test for open water lifeguarding of 500 meters/550 yards within 10 minutes or less if tested in open water or 9 minutes or less if tested in a pool. The workout is 1000 - 2000 less yards than our average US Masters swim team practice when I swam on a team. To compare a masters workout to the college team using the same pool, they swam up to 7500 yards per practice. Sometimes twice a day. Michael Phelps swam as much as 88,000 meters or 50 miles a week.
The 200 yards we ask people to swim for OW certification is really just a warm-up for a trained swimmer. The 400 yards a divemaster has to swim is 100 yards less than what we had to swim to pass American Red Cross Advanced Lifesaving/Lifeguard Training when I was in college. We had to complete it in 10 minutes or less. Today, you just swim 300 yards demonstrating proficiency with different strokes.
My summer workout consists of beach sprints and run - swim - runs. My favorite workout is a 200 beach run - 400 open water swim - 200 beach run x 4 - 5 sets at my local state park. The beach is 200 meters and the swim area is buoyed off at 200 yards end to end. I run from one end of the beach to the other, complete two laps of the 200 yard swim area swimming next to the line that marked the far boundary and run back. The fastest I did that this season was 8 minutes 20 seconds. I rest 1 - 2 minutes between sets depending upon the effort.
Having made many rescues in all kinds of diving, open water, and surf conditions, I'm a big proponent of maintaining United States Lifesaving Association and USCG rescue swimmer fitness standards for dive pros. If you are a pro or thinking about turning pro, becoming a USLA lifeguard or American Red Cross lifeguard with Waterfront component is a great thing to do. It will enhance your skills and give you more options to better assist or rescue a diver.
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Don't forget to exercise on your towing kicks (flutter and frog in supine position; and scissors side kick), ideally with lifeguard rescue can and a "volunteer victim" --but a swim kickboard by yourself at the pool is fine.
This was my weekday MWF pool workout routine when I had non-professional first responder American Red Cross Lifeguard & PADI Rescue Diver ratings, and was on once-a-month weekend volunteer crew 24/7 at the Catalina Hyperbaric Chamber for a year:
500 yards (or 500 meters in Olympic size pool) slow & easy warm-up Free-style under 14 minutes --roughly approximating the GUE Swimming Requirement.
Then continuously without stopping:
50 yards or meters resting Breast Stroke
200 yards or meters Scissors side kick (alternate sides every 50);
50 resting Breast Stroke
200 kickboard work Flutter & Frog (alternate every 50);
50 resting Breast Stroke
200 kickboard work Dolphin & Frog (alternate every 50);
50 resting Breast Stroke
200 kickboard work Backstroke Flutter & Frog -Supine (alternate 50);
50 resting Breast Stroke
200 Free-Style Sprint (at 70% max effort, six-beat flutter kick on last 50);
50 resting Breast Stroke
100 Free-Style Sprint (80% max effort, six-beat flutter on last 50);
50 resting Breast Stroke
50 Free-Style Sprint (all out max effort, full continuous six-beat flutter);
50 resting Breast Stroke
50 Free-Style Sprint (all out "whatever is left and die" effort);
50 slow & easy Breast Stroke
Warm down stretches legs, back, shoulders & arms;
50 underwater breath-hold pull & glide Breast Stroke (notify Lifeguard first);
Tread Water 15 min & finally "Dead-man Float" back stretches.
On Resting or Fun Non-Diving Weekends:
Run a mile at the beach;
Either 1500 easy free-style
or 200 medley (Butterfly, Back, Breast & Free-Style).
Circuit train in weightroom twice a week for endurance (no more doing five days a week power pyramid sets/max lift sets for me --I'm getting too old for that!)
My emphasis above was endurance on the variety of kick styles (Frog, Flutter, Dolphin, & Scissors and surface flutter kicks supine on back) that I would use during a recreational or technical dive, or on a victim surface towing rescue. . .