Hello Rumbly. No need to panic! There is lots of time before your big ride. And congratulations on signing up for it -- it looks like it will be quite an adventure.
The best way to prepare for a challenging bike ride is to go out and ride your bike. It may sound obvious, but really it just means the best way to condition the muscles you'll need to strengthen is to do the activity that you want them to be strong for. As you ride, you'll no doubt find issues to be addressed, such as changes to the way the bike fits you, a new saddle that is more comfortable, the right clothing to wear, what to eat and drink before and during the bike ride, stuff like that. You'll find lots of information on this forum, and we're always happy to try to answer any questions.
The most important thing to remember is: have fun!
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles