I haven't managed an IM two months out from a break but had similar experience to many of the previous posters. Broken mine twice - once compound (out of skin exposure) and once a clean separation internally coupled with some broken ribs. Mountain biking in the desert stone can be unforgiving at times...
Best thing is the trainer. You can set it up so that you don't have weight on the upper body. Just shift your seat so your sitting a bit more upright and wait a couple of weeks so that the throbbing with the increased HR goes away. You'll be able to push serious watts without any strain on your collarbone. The hard part is returning to road riding and getting your lowerback used to the aero position again. I recommend some yoga stretching to keep your lower back limber, again without weight on the upper echelon of muscles that would strain your collarbone.
I also did A LOT of pool running, which based on the literature isn't a great crossover to running roads, but it kept that bouncing that just made running unbearable disappear, while maintaining some of my fitness.
I can't speak to the swimming as I avoided that for 3 months min after each break, but you should be able to maintain an ok level of fitness for the other two disciplines relying on the trainer and pool running. Best of luck in your recovery!
Best thing is the trainer. You can set it up so that you don't have weight on the upper body. Just shift your seat so your sitting a bit more upright and wait a couple of weeks so that the throbbing with the increased HR goes away. You'll be able to push serious watts without any strain on your collarbone. The hard part is returning to road riding and getting your lowerback used to the aero position again. I recommend some yoga stretching to keep your lower back limber, again without weight on the upper echelon of muscles that would strain your collarbone.
I also did A LOT of pool running, which based on the literature isn't a great crossover to running roads, but it kept that bouncing that just made running unbearable disappear, while maintaining some of my fitness.
I can't speak to the swimming as I avoided that for 3 months min after each break, but you should be able to maintain an ok level of fitness for the other two disciplines relying on the trainer and pool running. Best of luck in your recovery!