My wife introduced me to 7 FIT a few weeks back. It's a 7 minute workout app and it's really good. 

For those who doesn't know, the 7 minute workout is proven to be effective in building muscles and endurance. It's good for those who doesn't really have time to hit the gym. My wife has been at it for a few weeks and she is now seeing improvement in her abdomen. Seriously, even though it's just a short period, but boy oh boy, do we sweat! 

But the downside the 7 FIT app is that it contains too much ads which I don't like. Therefore, I seek other alternatives. 

If you don't want to pay for 7 minute workout app and at the same time, you want it to be ad free, then the J&J Official 7 Minute Workout is for you! J&J stands for Johnson & Johnson.

The best thing about this app is that it gives video and audio instructions of the workouts. The audio part is brief but full with useful info. Both input really help in making sure that I do the exercises properly. 

This app doesn't just contain the basic 7 minute workout though. No oh no. It keeps track of your progress. When you think you're ready for the next level, it will suggest you the harder version of the 7 minute workout. Workouts range from 7 to 32 minutes. 

You can also customize your own workout by choosing the 72 exercises and 22 workouts available. For example, if you think you need to do more push ups in your workout, you can customize it to your needs. 

The downside of this app is that it doesn't change sides for a few exercises. For example, the side plank. It doesn't prompt you on when to change sides. But no problem, I can change sides on my own.