A free program for Android, by Jevgenij Zhukov.

Interval training is a form of cardiovascular exercise. It is used to perform a series of intense exercise sessions, each one consisting of a short period of intense exercise followed by a longer period of recovery. This type of training has a number of benefits, including increased cardiovascular and pulmonary (heart and lung) fitness, improved muscle strength and tone, and increased metabolic rate. It is commonly used to treat hypertension (high blood pressure), heart disease, heart attacks, and diabetes.

Flexible Interval Timer is an interval timer app. It has a simple user interface that allows you to create, edit, and save your workout routines. It is a tool that is going to help you with your interval training. This app is perfect for people who want to do interval training for health and fitness purposes. You can do any type of interval training, including crossfit, hiit, tabata, running, and more.