The Varibike Trike is faster and climbs more efficiently than conventional trikes. Varibiking is the most effective means of locomotion by muscle power. A scientific US study showed that (at the same heart rate) the maximum power output could be increased by over 30% using combined arm-and-leg cranking compared with normal cycling. Furthermore, the efficiency of lower-power steady-state power production was found to be higher for arm-and-leg cranking.* * - proven in a study of the New Mexico State University/USA 

You can download the stuy here


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 trike.