#effort

To perform an exercise so hard veins pop / max effort.

The unglamorous defensive graft in midfield.

Rate of perceived exertion — a 1–10 effort scale.

Straining so hard your neck veins bulge out.

A squat so heavy your knees threaten to cave.

Reps in reserve — how many reps you had left.

Doing the hard, tedious work toward a goal.

How hard you train, often as a % of your max.