V-Up
coreBodyweight
V-Up is a bodyweight core movement. It primarily trains the Rectus Abdominis, with the Hip Flexors assisting. In Rebar it is logged as weight × reps, so every set contributes to your volume, your estimated 1RM and your Strength Index. It is also called v ups, jackknife, jack knife.
Movement details
Primary muscle
Rectus Abdominis
Secondary
Hip Flexors
Equipment
Bodyweight
Tracked as
Weight × reps
Category
abs
Also known as
v upsjackknifejack knifesingle leg v upalternating v up
Track your V-Up
Log it in Rebar and this page becomes your record for the lift: every session, your heaviest set, and estimated-1RM progression over time.
More Rectus Abdominis exercises
Movements whose primary mover is also the Rectus Abdominis.
More core with a bodyweight
Same equipment, same area — useful when the rack is busy.