Often abbreviated as 基代 in fitness chat. Related: 代谢率 (metabolic rate), 热量缺口 (calorie deficit), 增肌减脂 (build muscle and cut fat).
culture
Smart scales (like Xiaomi's 体脂秤) and fitness apps (Keep, 薄荷健康) display 基础代谢 prominently, so this term is genuinely everyday vocab among health-conscious Chinese users - not just for athletes.