I'm not sure about the others, I'm actually interested to see what other responses you get, but as far as Equine Rehab goes, you have to be totally devoted and not mind long work days. I interened at the Kentucky Equine Sports Medicine and Rehab Center (KESMARC) for one week over the summer. As an intern, my friends and I put in around 75 hours for the week and one day was a half day. The other girls who were there for three months or more put in closer to 90. They were long, mostly miserable, days but totally worth it if you love what you're doing. I had a blast at Kesmarc and if it's something you're interested in I would def. Recomend getting on as an intern at either the center in Kentucky or Florida. I learned a ton!