Line hops
A target on the floor turns wandering into something you can see.
3 × 40 singles
Wandering on double unders
Like nothing at all until the rope catches.
The cue
“Own your spot.”
What it looks like
The feet drift across the floor over a set.
Why it costs you doubles
Moving feet mean the rope is aimed at where you were. It catches when the gap gets too big.
The fix
The drills for it, best first. The figure is the first one, at half speed — tap it to pause.
Wall singles
Facing a wall stops the lean and the forward drift at once, because the wall will not move.
3 × 30 seconds
Can the camera see it?
dulike can see this one from any angle.
It watches your body, not the rope: a speed rope is a few millimetres across and faster than a phone records. Whether a jump was a double is estimated from your time in the air, and how it works shows every threshold.
Not sure this is you? Film 10–30 seconds of skipping and dulike will check — along with the other faults it can see, and the one to fix first.