Gather materials per pair: 1 spring clothes peg (same type for all pairs), stopwatch or timer, data sheet, pencil, and optional alcohol wipes for shared pegs.
Standardize the setup: use the same peg model and spring strength for all students; hold the peg between thumb and forefinger of the writing hand unless testing hand differences.
Practice for 5–10 s to learn the full open–close motion. The peg must open fully each count; partial opens do not count.
Assign roles: Performer (squeezes and counts aloud) and Timekeeper (calls time marks and records counts). You will swap roles after the first run.
Run 1 (writing hand): on “go,” perform as many full opens as possible in 30 s. Timekeeper records the total for 0–30 s.
Rest exactly 15–30 s (use the same rest for everyone).
Continue immediately for the next two intervals without resetting the count aloud. Timekeeper records the additional opens achieved during 30–60 s, then during 60–90 s (counts per interval, not cumulative).
Swap roles and repeat Run 1 with the partner following the same timing and rest.
Optional Run 2 (non-writing hand): repeat the three 30 s intervals to compare hands.
Graph results for each person: x-axis = interval (0–30 s, 30–60 s, 60–90 s); y-axis = opens per 30 s interval. Plot both partners on the same axes for comparison.
Analyze briefly: note where performance drops, describe sensations (burning, slowing), and connect to energy use (aerobic early, increasing anaerobic contribution later). Record one or two sentences interpreting the pattern.