A free app for Android, by Apps Studio Inc..

Build stronger legs from the comfort of your home gym with Best Legs Workout. The app provides athletes with a list of workouts that will strengthen their core, tone their calves, and reduce fat. All exercises include a brief step-by-step guide, which is a lifesaver for beginners and first-timers. You can also check out the app’s how-to videos if reading a tutorial doesn’t work well for you. 

Although the developer should add more leg workouts, the exercises featured in the app are enough to jumpstart your fitness journey. However, be sure to supplement your workouts with a healthy diet. After all, abs (and strong leg muscles) are built in the kitchen.