To sum it all up, Thai boxing training can benefit just about anyone. Just make sure you adapt the workout to your level of fitness when you’re starting out. There is absolutely no shame in taking a break or modifying a drill to make it fit for you. Also, remember when practicing any sport there is always a risk of injury.
If you are new to this type of thing and indeed fitness it may be prudent to consult your healthcare professional for advice first. Also, let your Muay Thai trainer know of any injury or physical condition that you may have prior to practice.