I didn't, but starting in May, I have had bad SI joint pain keeping me off the bike for the past 8 weeks (going to try a short ride today). My physical therapist has me doing a stretching routine and I'm feeling much better. So will I keep doing it? It could be a correlation implies causation fallacy on my part and I would have healed in 8 weeks without it. But they're pretty easy stretches and only take about 15 minutes three day a week, so I'll probably keep it up.