Good Morning

Move · Resistance Training · Movement, Typed Supps

The bar sits on your back and travels forward, so the further your chest drops the harder your lower back and hamstrings have to fight.

Stage by stage

Set-up (Load sits above the hip): A bar on the upper back makes the whole trunk a lever the spinal erectors must hold isometrically.
During the set (Moment arm peaks at bottom): The bar-to-hip distance is greatest near horizontal, so demand is highest where the hamstrings are longest.
End of range (Hamstring length is the limit): Extensibility, not strength, ends most people's range — depth should follow the neutral spine, not a target.
Weeks later (Hinge pattern transfers): The isolated hinge reinforces exactly the position where deadlift technique breaks down under fatigue.

Muscles trained

Primary: hamstrings, lower back
Secondary: abs, glutes

Intensity

6 METs (Resistance training (weight lifting, free weight, nautilus or universal), power lifting or body building, vigorous effort (Taylor Code 210)).

Time to effect

Weeks: Hip-hinge control and hamstring flexibility improve, since the movement demands more balance and lumbar stability than most hinges.
Months: Hamstrings, glutes, and especially the lower back build real strength, often translating into a more stable squat and deadlift.

Related supplements

Creatine Monohydrate

Common myth

"Good mornings are too dangerous to program." In reality: With light-to-moderate load and a controlled range, good mornings are a well-established accessory lift; the actual risk comes from rounding the lower back or loading heavier than a lifter's hip mobility and hamstring flexibility allow, not from the exercise itself.

In the glossary

Evidence grade