What the test looks like

You stand on a force plate under a bar fixed at mid-thigh height, set up so your body matches the second pull of a power clean: flat back, shoulders in line with the bar, knees bent to roughly 120 to 130 degrees. When a senior international rugby union squad was tested, players had their hands strapped to the bar, pulled for about five seconds after a three second countdown, and gave three acceptable trials with four minutes of rest between each. The bar never moves. Only the force trace changes.

Why coaches pick it over a max lift

• Nothing is lifted or lowered, so there is no failure point and no heavy bar to control at the end of a maximal effort.
• One maximal effort lasts about five seconds, so a full set of trials fits inside a normal session.
• The score barely shifts between test days when nothing real has changed.
• When a max lift shifts between test days it usually drifts upward as lifters learn the test, but the pull moved in only two of the ten studies that checked, and by small amounts in both.
• The position gets standardised once, and peak force stays reliable across a range of knee and hip angles as long as your setup never changes.

What a player does on test day

• Warm up, then take practice pulls at building effort. Across the reliability studies the warm-up most often included two practice pulls at half and three-quarter effort.
• Set the position: bar at mid-thigh, flat back, shoulders in line with the bar, and the same knee bend every time.
• Pull maximally for around five seconds on the tester's count. The international testing counted three acceptable trials.
• Rest properly between efforts. That same protocol gave four minutes between trials.

How the data is used

• Tracked across a season to watch strength trend up or down, always on the same rig with the same settings.
• Compared against your own history rather than a teammate's, because the pulling position changes the number: a more upright setup has produced higher peak force than a bent one.
• Split into a one-leg version when a coach wants to compare left against right. The two studies that checked the single-leg pull, in adolescent athletes and netball players, found it measured peak force reliably too.
• Read alongside match output carefully. In the international squad, backs with higher peak force tended to record more possessions, passes and effective attacking rucks, while in forwards no pull metric lined up with match stats. That is a correlation in one squad, not a promise.