In the two most recent X-men films, Quicksilver has moved people just in time to save them from bullets/explosions etc. How is he strong enough to do this? In the new movie he moves about a dozen people outside of the building and this must require extreme stamina (and strength?).
Anecdote: I remember taking a first aid course where we practiced moving an unconscious person and it was surprisingly difficult. It really does take two people or at least a tool to move a person.
In the comics, Quicksilver does indeed have increased stamina. From the wiki:
Ability to move, speak and think at supersonic speeds, with enhanced stamina and durability
and
Also, he has a fast metabolism and can heal more rapidly than the average human.
His enhanced stamina can also be implied by the mere fact that he can run for sustained periods, rather than very short bursts, and his rapid healing means that if he carried someone out of the mansion, his arms would probably have recovered from the exertion on the way back to get the next person.
- Quicksilver was originally presented as a mutant capable of moving and thinking at superhuman speeds. Originally capable of running at the speed of sound, exposure to the High Evolutionary's Isotope E made it possible for the character to run at supersonic speeds of up to Mach 10 and resist the effects of friction, reduced oxygen, and kinetic impact while moving at super-speeds.
Quicksilver in his X-men movie persona does not appear to have extreme levels of superhuman strength but appears to be strong enough to grab a person, accelerate them into his frame of movement, without harm, and then move them from their location to one nearby without serious or long-term injury.
For many mutants, particularly ones whose powers are based in physical capacity, an increased level of strength is almost par for the course. Depending on when you view his character his upper body strength put him at the peak effectiveness for a Human at approximately 500 pounds lifting strength. His legs were rated at 1000 pounds.
A normal Human, perhaps even two are well within his ability to life, move, tow or even throw a short distance due to his denser bone, muscle and cartilage. While such things may be difficult for normal Humans to accomplish, even trained one such as firefighters, Pietro's strength and ability to utilize his super-speed for throwing and catching gives him a great deal more latitude in how he moves people from dangerous areas.
Note during the explosion scene in X-Men: Apocalypse, as Quicksilver starts running out of time, he is forced to get creative, throwing people out of windows and into swimming pools. This notes he was slowing down, possibly even getting tired, and had to begin to improvise to get everyone to safety.
In the comics his origin has undergone a change due to licensing issues between Marvel and Sony and his mutant origin has been retconned away. Originally Pietro and his sister Wanda were believed to be the children of Magneto.
Quinetic energy.
Quicksilver movement includes so much quinetic energy that moving a person should barely imply a glimpse of effort to him, compared to the effort to run at these speeds.
