Hey all. I'm very frustrated about this topic as well. I've definitely noticed that chlorine gives me flares and am excited to try the Vaseline idea as I am doing a mommy/daughter swim class with my baby girl and don't want to give that up.
I also have IBS and I've found that walking/running aggravate that, so that's out for me. I can't do yoga because I have carpal tunnel and any positions that require putting pressure on my wrists are out...so that means no push-ups either.
I love doing cardio training and pilates, but last time I did them I had a flare the next morning...and I'm not sure if that is what caused it or not. Seems like this means I need to just count my calories and do little amounts of exercise, but it SUCKS to do the IC Diet AND watch my calories/fat intake. Very frustrated right now.

I wanted to share with you what my pelvic floor rehabilitation doc told me about flares after pilates or any ab/core work. I flare as well and asked her why this was such an issue for me. I have endometriosis (and IBS- like you) as well, so this may not pertain to you but I have many trigger points in my abdomen. They are like knots of muscle that continue to cause pain whenever the muscle is activated. Also, the entire rectus abdominus are connected to your pelvic floor so when you enact them you can cause severe spasms in your bladder. She told me not to do any pilates, core work ever again because I happen to be hypertonic in the pelvic floor and go into severe spasms and pain with any core work. It contradicts everything my PT for back pain told me to do but she assured me with IC and the other health issues I have I need stretching exercises. I do alot of upward dog stretches and pelvic opening stretches. At this point she has told me no weights until the pelvic floor is relaxed more than it is now.

She also did dry needling on my trigger points and although extremely painful (and I had two huge bruises for a week and half after) I have felt much less spasming with daily activities. I highly recommend pelvic floor therapy to release the tension or you may end up like me-many more problems later. One more thing- she told me we get the trigger points from laprascopic surgeries, bladder pain before we were diagnosed, IBS pain, basically any chronic pain issue that remains untreated will create these knots in the muscle and they need to be worked out.