Fredrik Correa

After a short journey at the Royal Institute of Technology in Stockholm, Fredrik studied Sports Science at the Swedish School of Sports and Health Science in Stockholm (GIH) with focus on ice hockey, earning a B.Sc. degree. He has worked as an ice hockey coach for 15 years in different clubs and for The Swedish Ice Hockey Federation.

Further studies in physiology and several projects in exercise physiology at The Karolinska Institute led him to medical studies at Karolinska where he graduated in 2006. Fredrik is now a M.D. and has worked as a resident physician at Danderyd Hospital in Stockholm where he became a specialist in 2016.

In 2011, Fredrik founded Exxentric together with Mårten Fredriksson. In his current role, Fredrik oversees Exxentric’s product development department and offers his flywheel training expertise as a participant in strength training events, podcasts and interviews for audiences all over the world.

See also

To read Fredrik’s blog posts, see our news page.  For interviews and podcasts with Fredrik, see also our media page.


You can get in touch with Fredrik easily via Twitter or LinkedIn. You can also use our contact page or contact him directly via email.


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kBox4 Active

The Newest model, the kBox4 Active is built on proven, reliable technology. The perfect tool in strength and rehabilitation at our lowest price point.

  • Newest Model
  • Holds 1-2 Flywheels
  • kMeter Compatible
  • Weighs 15 kg
  • Starting at €1 410 / $1 635
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kBox4 Lite

Often chosen for its smaller foot-print, the kBox4 Lite model is of a lower weight, portability and not to mention its competitive entry cost level.

  • Portability
  • Holds 1-4 Flywheels
  • Built in kMeter
  • Weighs 9.5 kg
  • Starting at €2 300 / $2 665
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kBox4 Pro

The kBox4 Pro is our premium model with the greatest versatility. It’s ideal for sports teams and larger training and physiotherapy facilities.

  • Largest Floor Space
  • Holds 1-4 Flywheels
  • Built in kMeter
  • Weighs 15.5 kg
  • Starting at €2 990 / $3 465
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The kPulley2 is the ideal horizontal solution for improving strength by offering flywheel training for rotational and pull exercises.

  • Horizontal Model
  • Holds 1-2 Flywheels
  • Built in kMeter
  • Easy to assemble
  • Starting at €1 890 / $2 190
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