Here is a great, simple workout that you can do in about 10 minutes and at home. Choose 2 functional exercises and make sure you have appropriate space and equipment. For the purpose of this example, I will use the squat and the push-up.
Here is how it works: Perform 1 squat, immediately followed by 10 push-ups. Rest 30 seconds. Then perform 2 squats followed by 9 push-ups, rest 30 seconds, and so on until you get to 10 squats and 1 push-up. At this point, you will have done 55 repetitions of each exercise.
If you have more time, you can add a second workout with 2 different exercises. Add weight or variations to make it more challenging if desired. Mix up the exercises each time you do them, so you aren’t repeating the same movements too often.
Simple, functional, efficient.