> If you're exercising for cardio, and you're able to follow your book or podcast, you're probably not doing good cardio.
Nonsense. Elite distance runners are doing 80% of their miles at essentially a conversational jog with a starkly lower HR than the 20% of intense miles. Cardio exercise under all levels of intensity is optimal, not just easy or just hard.
Nonsense. Elite distance runners are doing 80% of their miles at essentially a conversational jog with a starkly lower HR than the 20% of intense miles. Cardio exercise under all levels of intensity is optimal, not just easy or just hard.