For this app to work you need the Vitalmonitor Pro or the FLOW HRV. How relaxed/recovered do you feel now? When and how intense should your next workout be? You don't know? We do... Measure yourself into top shape! The revolutionary Vitalmonitor measurement and monitoring system measures your current physical status, the regeneration status and enables you new approaches of training control. Everywhere, everytime. Fast, precise and non-invasive. Vitalmonitor is the world's first manufacturer