I like the 7 Minute Workout apps. Most have a good mix of exercises and require little to no equipment. Very convenient. I wish there was some consistency with the how-to videos. They are pulled from random sites and some are way too long to watch with too much narration. The videos showing the basic breakdown of the exercise with minimal narration work better in an app environment.
mr beast mister about Butt Workout: Fit at Home, v1.1