to run or not to run

I'm having difficulty in my fitness journey. I am within my weight goal, so I tend to do a balanced mixture of cardio and working out. Where I jog on the weekends twice and workout during the week three times. Recently I've been given the opportunity to run with an organization that enjoys jogging as much as I do. My only problem is, I've been trying to increase my muscle mass since I'm naturally a more slim guy. But I feel like many people either chose to focus solely on body building or losing wieght, whereas I want to gain muscle without giving up running at least twice a week for about 35 with out sacrificing all my muscle progress. Any recommendations or help would be appreciated