The crossword solution for the term 'Aerobics Accessory' is STEP, which is a four-letter word. Aerobics is a form of physical exercise that combines rhythmic aerobic exercise with stretching and strength training routines. An accessory is an item that can be added to something else in order to make it more useful, versatile, or attractive. Therefore, a STEP is an accessory commonly used in aerobics classes to help participants increase their heart rate and improve their balance.