I am trying to build muscle and I want to focus on increasing the size of my thighs and glutes and possibly slim down my waist. However, I was wondering whether I should exercise other parts of my body a little as well. I am happy with other parts of my body, but I was wondering if there were any health benefits from ensuring my whole body maintains a certain level of fitness or if I can just ignore other parts of my body and focus on the areas I want. My body is in a healthy shape, but I could do with being a bit healthier, as I often get out of breath quickly.
Can I just focus on certain body parts and ignore other parts completely or should I maintain a minimum level of overall fitness?