徒步计算器API产品，通过MET公式计算徒步消耗的卡路里，输入步道长度、海拔增益、体重和背包重量，精确预测徒步能量消耗，帮助用户准备徒步行程。
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脂肪燃烧区计算器API通过年龄计算最大心率，估算理想心率区间(60-80%)，采用Zoladz和Karvonen方法。帮助用户最大化脂肪燃烧，提供卡路里消耗和理想体重计算工具。
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