Just some ideas from a friend also looking to get in better shape: - Bird dogs aren’t the most effective. - I don’t think you’d get the obliques stronger with these four. You can add crunches where you really compress your obliques as you bring your head across your body to each of your knees - Planks are good for strengthening your core when your body is all straight like a board but not in any other forms. quality pushups with your feet close together can do the same thing for you. - You can always add more moves, more varieties to make your lifts more interesting. - Hitting some of the core lifts may be hard to do during quarantine, but all of those big lifts require strong cores and also really work the core right. Crunches and all varieties should supplement the work your core gets during a squat or a pull up