Query Fitbit health data including sleep, heart rate, activity, SpO2, and breathing rate. Use when user asks about their fitness, sleep quality, steps, or health metrics.

查询Fitbit健康数据，包括睡眠、心率、活动、血氧饱和度和呼吸频率。当用户询问其健身、睡眠质量、步数或健康指标时使用。