I usually swim sub-24 for 70.3.
I will be at a remote cabin all summer. I will be heavily reliant on the Vasa this summer.
There are 3 problems that I foresee:
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The vasa will not help build good swim fitness.
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My vasa doesn’t have any kick attachments. (They look stupid anyway.)
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Vasa training uses swim muscles, but the resistance and acceleration are off.
I think one can replace one or two swim workouts per week with the Vasa.
I am going to try to get 2 pool swims per week. I will focus more on speed, fitness and kick during the few pool workouts I will do.
I’ll predict that even though the erg could work for you, you’ll just end up not using it if it’s not super-troublesome to hit the pool 2x/wk.
The main limiter is that you will probably find the erg ming-numbingly boring compared to pool swimming, especially as a good swimmer, so much so you won’t want to do it more than a few times. I have to rely on either workout videos, or podcasts, or other media to keep going on a regular basis, or else I just don’t want to do it anymore. (I suspect it’s still better than an endless pool, though!)
In your case, your technique is clearly already well developed, so even though the erg might be slightly different, it won’t adversely affect it.
The erg is more problematic for beginners with real stroke errors and body balance issues in the water, since obviously the erg won’t solve those water issues. It’s also really hard to do a proper catch-up style stroke on the erg, but if you can already do it properly in the water, it doesn’t adversely affect it.
I’ve used the erg a ton in the past, but now that my kid is a teenager and I’m not as desperately time-constrained, I really look forward to my pool sessions (partly because there are other people there!) and haven’t used my erg much as a result in the past 2 years. I sadly didn’t get any great speed bump from moving to all pool swimming, and in fact, I’m in the process of transitioning back to swim+erg to ease some of the scheduling issues.