I've spent most of my 10,000 - 12,000 yds per week of winter and spring swimming in an indoor 25 yd
pool for the purpose of training for triathlons up to the olympic distance or half ironman. Due to
heavy rains making the lakes here muddy and full of floating logs, trash, etc., I've only been out
in the open water about 3 or 4 times this year. Today, I had the opportunity to swim in an outdoor
100M pool.
I realize a 100 M outdoor pool does not have the same conditions as open water, but it certainly is
closer to the real thing than an indoor 25 yd pool because you're swimming 4.37 times farther before
you get to push a wall. In order to test the importance of training in the conditions in which you
will be racing, I decided to do a short timed swim in the 100 M pool for comparison to those I've
done in the 25 yd pool. My most recent 1000 yd time was 16:23, so I entered that into the
swiminfo.com site to give me a predicted 800 M time in a 50 M pool of 14:50. Since they don't have
an estimate for a 100 M pool, I would say that it should be 14:58, using the 1 second per turn rule.
My actual time today was 15:05, which I did without really using an all-out or even optimal level of
effort. Last year, it took me about 17 minutes, so it is clearly better to train in a small pool
than none at all.
Now, for the more subjective aspects of it, I must admit that I did not feel prepared for this long
course swimming. Compared to short course swimming, I didn't have a good feel for what the level of
effort should be. I felt the muscles in my upper thighs fatigue more quickly from kicking than they
would in a shorter pool. I noticed that it took much longer to recover if I started breathing too
heavy. Toward the end of the 800 M, I also had to fight hard against the tendency to "slouch" in the
water. My arms and upper body did not fatigue. Except for having black lines to follow and having
clear water, it was pretty much the same as open water swimming.
My advice to anyone planning open water events, but forced to train in a pool is to pick as big a
pool as you can find and practice taking some sighting (loping?) strokes every 10 strokes or so.
Also, try doing some timed pieces a bit longer than the race you're planning. For example, if you're
planning a 1500 M open water swim, then you should be swimming some occasional 2000 yd continuous
swims if you're training in a 25 yd pool, since 10% or more of that 2000 yds is done with momentum
from the wall push.