Updated May 19, 2026 · v3.10.6
HRV: key to recovery
The STAY FIT app helps you gain insight into recovery, energy, and resilience. With personal HRV measurements, you can see how your body responds to exertion, stress, and relaxation. This gives you better insight into the role of sleep, workload, exercise, and lifestyle. The app works with a Polar heart rate monitor and provides real-time feedback during cardio and relaxation exercises. There's also a personalized fitness and resilience plan, in collaboration with your fitness coach, occupational therapist, or physiotherapist. Use the app at home, on the go, or on vacation. Tri-weekly sessions with our lifestyle coach are also available for additional support. How does this app help you? • High levels of stress or tension? Discover how short relaxation exercises have a measurable effect on your recovery. • Training hard but still feeling tired? See if your recovery is aligned with your exertion, so you train smarter instead of harder. • Restless nights? Gain insight into how your sleep relates to your recovery and what you can do during the day to wake up refreshed. • Long-term fatigue? Track whether your body is actually recovering or just resting without truly recovering. • Work pressure or a busy schedule? See immediately how your recovery is affected by daily demands, so you can learn to balance things better. • Recovering from an injury or complaint? Combine this with guidance from your physiotherapist or coach and track objective data alongside your feelings. Who is this app for? • People who want insight into their recovery and energy • Athletes who want to train and recover smarter • Clients who receive guidance from our physiotherapists or coaches • Anyone who wants to better understand stress, fatigue, or sleep • People with chronic fatigue and/or burnout symptoms Key features: • HRV morning measurement, exercise measurement, and stress measurement • Connection with a Polar heart rate monitor • Data-driven coaching for cardio and relaxation exercises • Personalized fitness training plan based on your capacity • Additional lifestyle coaching and education to support your progress
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