Person running on trail

people 40 44 years 40 45 years 40 49 years 40s active activities activity adult adults california cardiovascular activities cardiovascular activity cardiovascular exercise cardiovascular exercises cardiovascular workout caucasian caucasian ancestry caucasian ethnicity caucasians commitment committed concentrate concentrating concentration country countryside day days daytime determination determined discipline disciplined distance endurance exercise exercising field fields fitness focus forties full length grass health health and fitness hill hills hillside hillsides landscape landscapes los angeles male males mature adult mature adults mid adult mid adults mid adult mid adult man mid adults motivated motivation one person outdoor outdoors path paths pathway pathways physical fitness run runner runners running runs rural scenic scenic landscape scenic landscapes self control strength strong trail trail running training vertical willpower