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Isolation

Rear Delt Fly

Trains rear delts first, with real work landing on upper back.

Muscle contribution per set

Rear Delts1
Upper Back.25

These are the weights Forge'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

3down
1pause
2up
0squeeze

Dumbbell or machine rear delt fly with pause; tempo maximises rear delt and scapular retractor work.

Slight elbow bend; lead with elbows, squeeze at top.

Derived from tempo research on this movement class — Wilk M, Zając A, Tufano JJ.

How Forge 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.

Swap it for

Same movement pattern, same progression continuity — these are the alternatives the app offers mid-session when a rack is taken or equipment isn't there.

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