WordNet
sliding seat
n. rower's seat that slides fore and aft
Usage examples of "sliding seat".
She got up from the sliding seat of the rowing machine, then flopped down on to the deck.
He felt good from the moment he slipped into the open cockpit, tucked his feet into the dogs bolted to the foot rests, and pushed the sliding seat back and forth a few times on its twin runners to limber up his abdominal muscles.