Variety that wins

 When varibiking, you can switch between your arms and legs, and even different drive styles. This means individual muscle groups can rest and recover while you're actually still riding - which is why you will have more stamina than you do when riding a normal bike. 

Worldchampion.

At the HPV-Worldchampionship 2017 Varibikes won all gold medals in the category HF-Bikes (Hand- and Feet Bikes).