What does MMT grade 3 indicate about a muscle's strength?

The indication of MMT grade 3 reflects that a muscle can hold its position against the force of gravity without any external resistance. This means that while the muscle can generate enough strength to overcome the weight of its own mass when acting against gravity, it does not have the capacity to withstand additional pressure or resistance from an external source.

In the context of muscle strength assessment, grade 3 signifies that the individual has a basic level of muscular endurance and strength to maintain a position; however, their strength is not sufficient to resist more challenging forces. This level of assessment helps clinicians and fitness professionals to categorize a patient's or client's functional ability and to plan appropriate rehabilitation or training programs.