A scatter plot + curve fit with "time to complete a cycle ergometer sprint" on the Y axis and "Vastus lateralis muscle temperature" on the X axis. Warmer muscles produce a better (lower) time. Muscle warmness comes from (in increasing order of effectiveness) nothing, hot showers, diathermia, and warm-up exercises.
https://xoxo-media.sfo2.cdn.digitaloceanspaces.com/media_attachments/files/116/689/282/950/071/593/original/e77adfd65bb5a1eb.png