The library
Isolation

Bottle Lateral Raise

Trains side delts first, with real work landing on traps, front delts.

Muscle contribution per set

Side Delts1
Traps.20
Front Delts.15

These are the weights Heatwayve's volume audit actually computes with — deliberately conservative, so compounds don't masquerade as full coverage. A 0.5 means a set counts as half a set for that muscle: meaningful help, not a replacement for direct work.

Tempo

2down
0pause
2up
1squeeze

Light-load isolation depends on tempo rather than load; the top pause keeps the delt working where leverage is hardest.

Filled bottles; lead with the elbows, stop at shoulder height, no swing.

Derived from tempo research on this movement class.

How Heatwayve progresses it

Progresses by load in +0.5kg steps. Isolation work is where the honest-volume ledger pays off — compounds alone don't cover it.

Train with intention. Open Heatwayve — it prescribes the weight, watches the reps, and does this arithmetic for every set you log.