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How to do 4x4 intervals

If you're able to train 30 minutes couple of times a week 4x4 intervals will give good results.

How to do 4x4 intervals

Speed intervals are the best

Looking for the perfect running session? Here’s an interval session that works just as well all year round, and both indoors and outdoors.

Speed intervals are the best

Birken

See Swix waxing tips for the Birkebeinerrennet 2026 and get optimal skis for the race. Swix Racing Service offers professional waxing service in the days before the start, so you can arrive at the start line as well prepared as possible

Birken

Vasaloppet

Here, you will find Swix's wax tip for Vasaloppet and Vasaloppet Winter Week 2026.

Vasaloppet