stretching
balls to the wall
crank
toilsomeness
operoseness
laboriousness
virtuosic
pedal to the metal
put the pedal to the metal
skilled
hard-fought
effortful
full blast
go for it
all out
clutch
marathonic
superior
advanced
someone's heart out
above the rim
with all one's might
sure-handed
hit one's stride
equal
adequate
full throttle
find another gear
agentic
vaultingly
go to extraordinary lengths
one's socks off
get up early
challengingness
large order
hyperachievement
back
tall order
exacting
effortfulness
a hundred and ten percent
find
swan song
labored
nonability
laboured
strivingly
pass out
pull
skillful