While swimming, your body burns 3.5 METs (223 calories per hour) treading water at a moderate effort; 8.3 METs (528 calories per hour) for a medium-speed, vigorous effort crawl; and 13.8 METs (878 calories per hour) for butterfly stroke. (These estimates are for a 140-pound adult.) https://www.shape.com/fitness/cardio/how-many-calories-does-swimming-burn
感覺跟Garmin手表給出的數值差不多。我做運動的體會就是,絕大多數運動消耗的熱量很少能超過自己1小時費力(比賽)跑步消耗的熱量。