The "interference effect," otherwise known as the concurrent training effect, is controversial in the academic literature. Shannon discusses the AMPK pathway that is hypothesized to interfere with strength/muscle gains.
0:00: Introduction
3:30: Interference effect
5:08: AMPK pathway
10:35: Chronic effects of too much cardio
14:20: Keep your HIIT sessions short
16:55: Periodize your HIIT
18:20: Complete HIIT at the end of your week
19:20: Focus on strength training first
21:30: When should you add HIIT back in?
Study referenced
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