If you are looking to increase lean muscle mass and keep the fat begins down with food intake and recovery

I know a lot of ppl today are endomorphs its hard to keep the fat (im in the same boat)

if ur not getting enough protein added with a solid exercise program .. u did not win a lot.
+ Other aspects of the diet should be ur clean

under the aspect of race .... try to go through web search and HIIT training ... easier and more effective ... 10 miles not only start burning and muscle protein, but the development is not good ur slow fibers

if you can afford it in ur routine .. mix in circuit training to keep your heart rate to burn fat and calories