Like most other hinge exercises, the good morning has its own set of inherent disadvantages and dangers that may make it incompatible with an athlete or their training goals.
So long as the alternative targets the erector spinae, glutes or hamstrings through a similar movement pattern, it can readily substitute the good morning.
Good examples include:
The back extension is a compound posterior chain exercise involving the lifter hinging atop a back extension rack as their legs remain immobile.
This largely eliminates the involvement of the core musculature outside of the erector spinae and portions of the lower back, replicating the general hinging mechanics and recruitment pattern of the good morning.
Unlike the good morning, the back extension machine does not require any sort of free weight equipment, and is frequently performed entirely unweighted. In certain cases, the back extension may even be safer than the good morning.
All that’s needed is the back extension rack itself - though more advanced exercisers may grip a weight plate or dumbbell between their hands as well.
Unless performing back extensions loaded, sticking to higher repetition ranges will help keep training intensity sufficient for growth.
2-4 sets of 10-20 repetitions is a good starting point.
As always, lifters should ensure they are in fact hinging through their hips rather than curving the lower back forwards.
The glutes and hamstrings should remain engaged throughout each repetition, and the lower back kept neutral through core bracing and proper hip positioning.
The reverse hyperextension is yet another posterior chain movement targeting the glutes, hamstrings and erector spinae.
Unlike good mornings, reverse hyperextensions do not involve any actual movement of the trunk, and will instead lever the legs through hinging at the hips.
Apart from targeting the same muscles as good mornings, this also allows the lifter to further expand upon the latter movement’s non-axial loading of the back - nearly eliminating strain on the spine.
Reverse hyperextensions will require a reverse hyperextension rack, machine, or a similarly high object to suspend the trunk off the floor - like a bench.
Similar to back extensions, reverse hyperextensions are most often performed unloaded due to the difficulty of actually loading the lower body without involving the arms. As such, volume is amped up to compensate.
2-4 sets of 12-20 repetitions should be sufficient.
Lifters may be mis-cuing the exercise by thinking of the movement as a leg curl. Instead, driving the hips into the pads will help achieve the sort of gluteal activation needed to perform the exercise correctly.
The end-all be-all of posterior chain hinge exercises; Romanian deadlifts are a variation of barbell deadlift where the knees are bent as minimally as possible, maximizing emphasis on the glutes and hamstrings while replicating the same benefits of good mornings.
The Romanian deadlift is less a substitute and more of a direct upgrade to the good morning, as it is both more effective yet also significantly more fatiguing to perform.
Rather than acting as a secondary compound movement, Romanian deadlifts are better utilized in situations where the good morning is found to be insufficiently stimulating as far as strength and hypertrophy development goes.
Romanian deadlifts require only a barbell and a set of weight plates.
Like all forms of deadlift, the Romanian variant can be quite taxing when performed for high volume.
3-5 sets of 5-8 repetitions should be the general range of volume most non-specialized athletes aim for.
Lifters performing a Romanian deadlift should refrain from locking out their knees completely.
Aim to keep a slight amount of flexion, but to avoid complete extension as this will limit hamstring engagement and lead to a breakdown in overall form.
With how similar the majority of good morning alternatives can be, the “best” one is simply whichever fits your current equipment and training situation.
For a machine-based lower risk exercise, machine reverse hyperextensions will work best. Likewise, for a more intense strength-focused workout, swapping for Romanian deadlifts is a solid substitute.
References
1. Dicus JR, Ellestad SH, Sheaffer JE, Weber CA, Novak NC, Holmstrup ME. A Comparison of Muscle Recruitment Across Three Straight-Legged, Hinge-Pattern Resistance Training Exercises. Int J Exerc Sci. 2023 Jan 1;16(4):12-22. PMID: 37113509; PMCID: PMC10124728.