The ability to hold or repeat a muscular contraction for a long time is known as

Muscular Endurance: the capacity to use muscles efficiently over a longer length of time. The capacity of a muscle to contract repeatedly or to sustain continuous contraction with less than maximal force. The one-minute sit-up or push-up test can be used to assess muscular endurance.

when i got mine it was about a 6 or 7

gynecologist i believe