Rule 34 Dev - 2015 aaron_(artist) abs anthro armband athletic backless_gloves biceps big_muscles biped black_hair black_hooves black_tail border brown_fur brown_nipples bulge clenched_teeth closed_eyes clothed clothing detailed_background digital_media_(artwork) draft_horse dumbbell equine erection erection_under_clothes exercise fingerless_gloves front_view fur gloves gym hair headphones hi_res holding_object hooves horse inside jockstrap long_tail male male_only mammal manly motion_lines multicolored_fur multicolored_hair multicolored_tail muscular muscular_male nipples orange_clothing orange_gloves pecs penis penis_outline pepsi_(fa) portable_music_player pose punching_bag rainbow_clothing snout solo standing tan_fur teeth thick_penis topless two_tone_hair two_tone_tail underwear vein victor_jankowski weightlifting weights white_border white_fur white_hair white_tail workout|2766280144