Single-under is a conditioning movement on Fiz. Standard jump rope. Primary muscles: cardio, calves. Scored by reps.
Conditioning

Single-under

Standard jump rope

Category
Conditioningmixed-modal work under fatigue
Logged as
Reps
Primary muscles
Cardio, calves
Secondary
Shoulders, forearms

Scaling ladder

1 harder
Double-underJump rope with double rotation per jump
Single-underWorks cardio, calves

Frequently asked

2 answers
What muscles does the Single-under work?
Single-under primarily works cardio, calves, with secondary engagement of shoulders, forearms.
What's a harder progression from the Single-under?
Progress to Double-under once the Single-under is comfortable.
Conditioning movementsThe other 41 entries in this category The full movement library221 movements, with muscles worked and scaling both ways Log the single-under in FizFree on iOS and Android