Mountain climbing is supposedly a fun activity. And it’s not Brazilian samba. It may be fun ascending to the top of the world & having a clear view of everything for miles all around, but getting there takes strength, skill, supervision, steadfastness & succor. It can be dangerous too. Many people die, disappear or get hurt in the attempt. 

“We move!” as meaning any of these three: carrying on regardless of the situation; coming in agreement with your ‘peeps’ to go for something; or letting slide something that was supposed to happen, to continue your hunt.