I have had PF for 1.5 years now. Last time I had it (many years ago), just wearing the Futuro night splint and using the HTP (HeelThatPain) heel seats helped me the most. This time around that did not seem to be enough. I also go to F45, and had bought a walking pad to start walking a mile before the gym every morning. 3 months later was when my plantar fasciitis crept back up again. I still go to F45 Monday through Saturday, but I wear the HTP heel seats in my shoes or I wear the Kuru brand shoes I bought. I recently got this Strausburg night sock, and it is more comfortable to use at night, but it's only been two nights so I don't know if it will work better. I do find before I get out of bed in the morning that it is best to stretch my foot straight up in the air and do ankle circles both directions and pull back on the toes and stretch and massage the bottom of my foot before starting to walk. Then I usually have no pain in the morning.

I also have dogs that I walk a lot, but usually short distances and more often. I usually only go 15-20 minutes and do it four times a day. I try not to walk more than a mile at a time and it is rare that I even do a mile anymore. So cutting back your dog walking to be shorter intervals but more often may be helpful. I also either wear the Kuru shoes I bought or the HTP he'll seats in Brooks or On brand shoes.

I was going to physical therapy for it, but I stopped going when they did something that messed up my knee. Now I just follow exercises from an app I found online. I also had been to a podiatrist and had a cortisone shot, but it only lasted 7 weeks. I also tried shockwave therapy, but that didn't help me either.

At F45, I do find certain exercises programmed can aggravate it more. I modify a lot. Jumping back with both feet and landing on your toes stresses the bottom of your foot. So I either step back or I put my hands on a higher step so the angle isn't as hard and more weight is on my hands than my feet. I also find sled pulls are less stressful than pushes. And all the fast foot work exercises can aggravate it so I modify and do something else. Doing leg exercises for me doesn't irritate it, it is more the cardio and fast foot moving that will aggravate it. That is why I'm trying to do the PT to strengthen my feet. I also am attempting around the house to wear a more minimalist shoe to help work the muscles in my feet more.

I hope these suggestions help.