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When the Athlete Is Out of Sight
  • Training
  • Viktor Iovenko
  • 20 September, 2026
When the Athlete Is Out of Sight

# When the Athlete Is Out of Sight In outdoor sports, an athlete can disappear from the coach’s field of view within minutes. A runner enters the forest. A cyclist quickly moves several kilometres ahead. An orienteer disappears between controls. A skier moves onto another part of the course. The...

From Stopwatch to Real-Time Data
  • Training
  • Viktor Iovenko
  • 11 September, 2026
From Stopwatch to Real-Time Data

There was a time when athletes learned their results only after a training session or competition. Someone had to use a stopwatch, record the time and write the results down on paper. Then sports watches appeared, giving athletes access to many performance metrics almost immediately. Every techno...

The SFS Story Begins
  • Training
  • Viktor Iovenko
  • 31 August, 2026
The SFS Story Begins

This post marks the beginning of the SFS story. We are building SFS around one simple but important goal: to make training for endurance athletes more effective, more accessible, and, above all, safer. Our aim is to bring together data, technology, and real training experience to help athletes be...