HIIT
noun [ U ] uk/hɪt/ us/hɪt/
高强度间歇训练（high-intensity interval training 的缩写）
abbreviation for high-intensity interval training: physical training that consists of short periods of intense (= very energetic) exercise with short periods of rest in between
Use HIIT as part of your cardio routine. 将高强度间歇训练作为你日常有氧运动的一部分。