Plank - 30 Days Challenge
One of the most popular exercises for training in the world. The plank strengthens and tones many muscles of the whole body, including the shoulders, arms, lower back, and buttocks, but the main goal is the press. Improve your body in just 30 days. Start with 20 seconds a day and in a month you can reach up to 5 minutes of this exercise. We also added the ability to set your time for training.