Two of my nephews train in kick boxing and one of them also train in MMA. A childhood friend of mine runs a gym in Hawaii and he goes to Thailand every year to train and stay "certified". If you seriously want to learn the art of kick boxing, look for a place that teaches Muay Boran. It's the "ancient" style of Thai kick boxing that Muay Thai is derived from. If you want serious conditioning most kick boxing/mma facilities have their roman training that puts you thru different exercise stations non-stop for an hour. Pretty tough work out but you can take a break and not have to kill yourself to get thru it. Basically do as much as you can at each station in the time you are given. Good luck with your training and I believe you will enjoy it.......maybe not at first :D
