The term 'WORKOUT REMINDER' can be broken down into two crossword solutions: ACHE (4 letters) and SORESPOT (8 letters). ACHE is a common word used to describe a dull, continuous pain in the body. It is often associated with physical activity, such as exercise or working out. Sorespot is a less common word that refers to a specific area of the body that is particularly sore after a workout. This could be a muscle group or joint that has been overworked during a workout session.