IM and priformis syndrome

I can't speak to that particular injury, but if you can't get to the start line uninjured, you can't finish. So maybe give serious consideration to taking the recovery time now.

And then you have to make a decision about what kind of race you want to have at B2B.  How slow and/or miserable are you willing to be just to finish?

The folks at Setup are great. You might email them to see if you can get a deferral, or switch to the half, or just do the full aquabike.

Best wishes figuring this out.

OK, so you've made the decision that you're willing to be slow and miserable to finish. I understand that and have done that--one year spent 3:15 in freezing rain finishing a half mary because I needed to prove something (and I won't ever go down that road again). But if it were me, here are the things I would do at this point:

1) Get to a sports doc/PT (preferably one with endurance experience) ASAP. Get a good functional assessment done and prioritize daily PT (both office and home) exercises to strengthen whatever weak link you've got in your kinetic chain.

2) Get a bike fit check ASAP, preferably by the above PT if they have the experience. There could be something about saddle height, drop etc. that is aggravating whatever the injury is, and there may be some re-positioning that could help make you more comfortable on the bike given the current pain.

3) Start training now the way the race will have to be done. That probably means getting off the bike to stretch every 15-20 miles or so, and run-walking the marathon.

4) Take a light, recovery week or two. If your goal is to grind out the distance, never mind the speed, that may help more than anything.

But take all of this with a grain of salt. This is what has worked for me, but it may not fit for you.