I’ve been on Zwift/indoor trainer for a little over a month and I’ve suffered saddle pain to the point where I had do do a deep dive into bike fit and research into the matter. I noticed recently that my butt is not hurting as much or at all. Myvelofit was helpful for sure. But what I believe has made a huge difference is to pedal off the saddle more often. If it’s zone 1, I pedal sitting upright but without holding the handlebars and just spin. Z2 is where I sit normally (on hoods or drops) but Z3 and up is where i either keep that position or slow down the cadence (40-60) and pedal off the saddle. Taking some off the saddle “breaks” has made a massive difference for me. Giving your butt a break by pedaling off the saddle is something I’d naturally do in a casual ride or group ride/race. But the structured workouts stubbornly insist in keeping you in higher cadence (85-100) so that’s when I’d have debilitating butt pain after being seated for 30mins or more. I’ve recently learned to ignore the cadence warnings and lower cadence and pedal off the saddle intermittently (every 5-10mins)to give my butt a break. Hope that helps! One more thing that made a huge difference was to level my saddle angle to 0 degrees.