Start with 180 minus your age (a) for the fat burning zone upper limit target heart rate (z).

用180减去您的年龄，得到脂肪燃烧区的上限值。

youdao

The highly disputed "fat burning zone" refers to the target heart rate range that is supposed to help a person lose weight faster.

一个人的心跳率在一定的范围内，可以更快速减肥。这个范围叫”脂肪燃烧区“。这是个颇具争议的话题。

youdao

Zone: Set a target for pace or heart-rate (with optional heart-rate monitor) and track progress in a simple full-screen graph throughout a workout.

ENGADGET: TomTom makes own-brand GPS sports watches, no Nike swoosh in sight (updated: details)