Which of the following is a good way to gauge muscular endurance

The number of sit-ups you can do without stopping.
The number of sit-ups you can do without stopping.

Habit 1: be proactive  habit 2: begin with the end in mind  habit 3: put first things first  habit 4: think win-win  habit 5: seek first to understand, then to be understood  habit 6: synergize  habit 7: sharpen the saw