This is Optimal Health Daily.

How long should your workout be to build muscle?

Part 2 by Christian Finn of Muscleevo.net, and I'm Dr. Neal.

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part two and continue optimizing your life.

How long should your workout be to build muscle? Part 2 by Christian Finn of Muscleevo.net.

Should you limit the length of your workouts to 45 minutes?

However, this hasn't stopped some trainers saying that there is an ideal workout length.

In fact, you'll often come across claims from the exercise police that you shouldn't lift

weights for more than 45 minutes. If you do, testosterone levels will plummet.

Cortisol levels will rise and you'll be sucked into a catabolic black hole from which you'll

never escape. The idea that you should stop training after 45 minutes because you reach

some kind of hormonal tipping point is one of the most ridiculous things I've ever heard. It's a claim that fails on

a couple of levels, most notably the fact that it's not true. In fact, some workouts lasting more

than 90 minutes have been shown to raise testosterone above resting levels for at least two hours

after the workout has finished. What's more, the idea that the short-term hormonal response to training has a big impact

...