Basic drills

Hi. Recently I switched from Boxing to Muay Thai. I’ve begun to learn the basic strikes and would like to know what are the best drills for beginners to practice to build a solid foundation Muay Thai.

I have access to my martial arts gym 24/7 and a 13 year old younger brother (I’m 16) and all of the gym’s equipment

I would love to know drills to practice both with him and all by myself when I’m not at training. Please let me know if you have anything, Thank you.