Your heart rate when lifting weights increases as your heart works to circulate more oxygen to your muscles. Lifting weights doesn't meet cardio recommendations
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Heart Rate & Weight Training
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Changes in body composition, heart rate variability and aerobic fitness
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Heart Rate Zones For Different Types of Workouts
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R5 Zones - Heart Rate Training for Cardio
5 Smarter Ways to Train Your Heart (and Lose Weight)
Understanding Maximum Heart Rate - Breaking Muscle