Friend, this sport requires excellent physical conditions, I practiced kung-fu in my youth.
The modality of muay thai, as I told you, is very demanding.
I congratulate you for doing sports, of course, not with such intensity, the perseverance you have is important.
I did Muay Thai for 14 years. I loved every minute.
Before that I did karate, judo, ju-jitsu, and krav maga for many years.
Kung-Fu is amazing. I love martial arts, it is very good for the spirit. Makes you a relaxed and good person, usually :)