Tabatame is a timer. It does not give medical advice, diagnose anything, or tell you which exercises are safe for you.
High-intensity interval training is hard on the heart, lungs, muscles and joints. Before you start, talk to a doctor if you are pregnant, have or had a heart, lung, blood pressure, joint or other medical condition, take medication that affects your heart rate, are returning after an injury, or have not exercised in a long time.
Stop right away and get medical help if you feel chest pain or pressure, severe shortness of breath, dizziness, faintness, an irregular heartbeat, or sharp pain.
Warm up first, choose intervals that match your fitness, train in a safe space, and drink water. You train at your own risk. To the extent the law allows, Tabatame is not responsible for injury or health problems that come from your training.