a fit and youthful asian man performs bird dogs on the grass of an open field. lower back and ab workout

bird dog quadraped core exercise kneeling alternating abs back glutes butt workout lumbar spine train alternate bodyweight posture proper form ground grass morning male man asian southeast filipino range motion field outdoors outside sportswear fit fitness model muscle lifestyle athletic athlete health healthy physique lean buff working flexibility yoga pilates calisthenics balance malaysian meadow youthful performs dogs open lower lawn agriculture soil sports tree animal pet person plant farm mammal grassland clothing pasture prairie field workout