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Two young crossfit athletes exercising together at gym. Sporty fit couple having interval functional training class. Pretty female doing box jump exercise while muscular male doing back squats with ba
Alarm clock with notebook and pen on table in living room, closeup
Fitness woman doing cardio interval training outdoors. Caucasian female in sportswear exercising outdoors in morning.
High-intensity interval training workout. Hiit group training
Ventricular repolarization, T wave. The QT interval of ECG. The cardiac cycle. ECG of a heart in normal sinus rhythm. Resources for teachers and students.

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