Mr. Stamina is a free Android application developed by ShellBee Games under the category of Health & Fitness. This app provides a training program that improves endurance, cardio and helps in weight loss without leaving the house, using a gym or any exercise equipment. The program is designed to motivate users to train for only 4 minutes a day. This 4-minute training program replaces 30 minutes of intense running and also improves chest and shoulder muscles. The program is based on a TABATA protocol in which users have to perform the "Burpee" exercise for 20 seconds, which is followed by a 10-second rest interval. You can choose from three levels of difficulty based on your fitness level. Mr. Stamina is an effective way to improve your endurance, chest, shoulder, and leg muscles. Consistency is key, and you should not miss a workout and train every two days. After each workout, the app presents your progress and a scale indicating your endurance level and the muscles involved. Give Mr. Stamina a try and see the improvement in your cardio in just a month.