Bridge pose is an inversion I often introduce toward the end of a flow class once everyone is really warmed up. It's a class favorite because the foundation is accessible to most people. Those who struggle with the full expression of the pose are usually dealing with really tight chests and/or hip flexors, so if you're one of those people give yoga video for chest a try and work in this yoga pose for hip flexors and see if that helps.
Position shoulders and upper back on a flat bench and hold barbell across hips just below the bone. Place feet flat on floor hip-width apart and lower your glutes until they almost touch the floor. Press your hips straight up, pausing at the top before slowly lowering to the start and repeating right away. Tip: Drive through your heels to make this glute-intensive. You can also change the position of your feet — closer, farther, toes straight, toes out — to change the emphasis on the glutes.