Getting Some Sun Can Help With Muscular Definition
Sun exposure increases levels of hormones called melanocortins, which cause the skin to darken, otherwise known as tanning. These hormones work with leptin to control appetite while helping to increase the signals that stimulate fat burning in your cells. There is plenty of evidence from animal studies and laboratory work that supports these effects.
Now, just because building muscle mass or gaining weight is your primary goal, that doesn’t mean that you are going to throw muscle definition, aka “cuts”, to the wind. Although right now you may be focusing on getting physically bigger in mass / size, you don’t want to turn into a “chubykins” either. So, building muscle while maintaining low levels of body fat are a must.