IPA: //sʌbˈmæksɪməl//
KK: /sʌbˈmæksɪməl/
Referring to a level of effort or performance that is below the highest possible level.
The athlete trained at a submaximal intensity to improve endurance without risking injury.
Submaximal → It is formed from "sub-" (meaning under or below) and "maximal" (from Latin "maximus", meaning greatest). The word describes a level of performance that is below the greatest possible level.
Think of 'sub-' meaning 'under' and 'maximal' meaning 'greatest' — so submaximal refers to something that is under the greatest level.