There are countless workout plans for busy people: 7-minute workouts, 5-minute workouts, 3-minute workouts, and so on. While these plans do serve a purpose if you follow them, consider these quick exercises a way to make sure you’ll get some exercise during the day, not all of it.
A sport or other physical activity you practice regularly and can do for hours without looking at the clock is what will help you develop a permanent habit of exercise. Quick exercises rarely (if ever) produce a feeling of excitement. Have you ever looked forward to a session of leg lunges or jumping jacks?
20 minutes of bodyweight exercises in the morning each day is great. It’s enough to start your day on the right note and feel productive. However, adding even just one or two 60- to 90-minute sessions of exercises you enjoy more (for instance, swimming or playing tennis or cycling) is what takes you from one, less healthy category to another, healthier one (say, mildly active to moderately active).
For this reason, I highly recommend not settling with a generic workout plan just so you can maintain your fitness levels. Find something that will fire you up and not only make you maintain your current physical activity, but inspire you to surpass your fitness goals.