Uso dos membros superiores na Cruzbike

no BROL ainda não tem ninguém questionando os métodos! aliás, não cheguei a ver links por lá, ainda.

http://cruzbike.com/blog/2017/03/18/upper-body-aids-propulsion-on-a-cruzbike-bicycle/

Se existe de fato alguma vantagem, pra mim, seria nisto:

Citação :

Use of the upper body to add propulsive force is optional. Extra power is never “free”. However, there are great advantages to being able to distribute workload across numerous muscle groups. Muscles become depleted of metabolites. By-products like lactic acid build up within exhausted muscles. Maximum power can be increased and duration of exertion can be increased when more muscle groups are involved in the activity.

Nã0 ficou claro porque acontece e se em todas as mbb acontece tbm