Almost always because the lift is two beats and you are doing one. The knees drive up at hollow first, then the toes punch up. Most athletes try to fold to the bar from the belly button — it will never work, the leverage is wrong.

K2E is the scaling step on the way to T2B. The lift mechanic is the same; the range is shorter. If you can hold a clean K2E, you have most of what you need. The gap is hip flexor strength and timing.

With structure, two weeks of focused work gets most athletes their first linked reps. The structure is strict base, then the swing, then the lift, then the link. Skip any of those and progress stalls.

They look like one but they are not. T2B is a hip flexor + lat + timing exercise. The core works, but it is not the bottleneck. Most athletes who can hold a long plank still cannot do a T2B — that tells you everything.

Because the reset after each rep is missing. Drop straight down and you lose the swing. Push the hips back into arch quickly after the toes touch — that fast reset is what loads the next rep.

Hip flexors, lats, abs, and grip — in that order of importance for the lift. The hip flexors do the actual leg raise. Train them with strict knee raises and strict K2E and the kipping version starts working.