Here’s the minimum routine I do every time I lift:
75 seated bicycles, passing a ball between your knees (eg soccer ball, weighted ball, etc)
25 heels to the sky (laying down on your back, raise your legs vertically keeping them straight, then push to the ceiling)
50 sec planks on each side and forward
50 mason twists (seated with legs slightly bent and feet off of the ground, alternate hands from one side to the other, touching the ground; add weight to increase difficulty)