Chicken breast is a lean protein choice. Protein supplies amino acids that give structure to the body in skin, cell membranes and muscles.
The salsa can be made up to 24 hours in advance and refrigerated. Making it ahead will actually allow the flavors to blend.
If you're using a charcoal grill, plan on about 40 minutes to prep the grill and heat charcoal to the correct temperature. Gas and electric grills will take about 10 minutes.