The first time I tried to lose weight I didn't know what I was doing so I lost some muscle mass. This caused me to not be able to lose weight anymore until I gain the muscle mass I lost back. My question is, would it be a big deal if I trained muay thai and lifted weights while trying to lose weight at the same time. Then after I reach the size I want to be stop lifting. I was told its not good to lift weights when you train muay thai. But is it a big deal if I do this? I don't want to lift weights forever, just until I get back to my normal weight I used to be.