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Regular cardiovascular exercise also predominantly recruits slow-twitch muscle fibers, which are more efficient in utilizing oxygen than fast-twitch muscle fibers.
By performing both cardiovascular exercise and strength training concurrently, you are asking your body to adapt both aerobically (cardio) and anaerobically (strength training), which results in different hormonal triggers.
In it, author John Bryant talks about the deeply damaging side effects of cardiovascular exercise performed outside around busy streets.