I recommend the in-app "just get moving" option. It's barely 2 minutes. 5 pushups, 30 seconds jumping jacks, 30 second high knee jumps. Activates the whole body real quick. It is still better exercise than no exercise.
Start with stretching – stretching while still lying in bed helps you wake up, and continuing to help you stretch in the shower, while drinking your coffee, or when putting on your shoes gets the blood flowing.