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TL;DR: Is combining weights and cardio within the same exercise unwise or unproductive?

This video talks about cardio during weight training and describes how combining the two in a certain way can help the goal of maximising fat loss, specifically:

PHA incorporates an element of cardio into your weight training routines by forcing your heart to work harder.

This video, however, talks about HIIT and Tabata (albeit briefly) and criticises the use of strength training combined with cardio, specifically:

Be singularly focused; If you're trying to train for strength - train for strength; If you're trying to train for cardiovascular ... then do that, but don't try to combine the two because it becomes just stupid in the long run.

I am not sure if the second video is saying that the advice in the first video is actually wrong or if it is simply saying "do that type of training properly or don't bother."

I am not referring to this or this because I am asking if the two types of training should be used within a single exercise set at the same time at all, rather than on different days or for particular timings within a gym session.

Gravity Transformation: https://youtu.be/pndEy_YWfD0?t=7m14s ATHLEAN-X: https://youtu.be/sqlJcJfKZJw?t=3m15s

  • I heard from multiple sources that cardio is bad combined with strength training on the same day (e.g. like running for 30 minutes after your workout). However a few minutes of light cardio to warm up before the workout itself is recommended, as far as I know. Doing heavy cardio would be better on a separate day. unfortunatly, I can't back this all up with studies or science since my information about that also comes from videos and talking with trainers or other gym-goers. That's why I only state this as a comment! – Suimon Aug 20 '18 at 12:51
  • “I am asking if the two types of training should be used within a single exercise set” - I honestly can’t imagine why you would even want to. If you want to build muscle/strength, focus on that. If you want to build cardio, focus on that. If you want to do both, keep them separate. It’s far more efficient that way. – JustSnilloc Aug 20 '18 at 13:32
  • @JustSnilloc I think the point would be to get the most caloric burn possible. I'm concerned that it would have detrimental effects, however. – Matt W Aug 20 '18 at 14:06
  • What do you want to do? If you want to be a powerlifter, introducing cardio into your bench press is not productive. If you are a busy person that makes it to the gym once a week, perhaps introducing some cardio is getting you the most out of your time. Assuming you are challenging yourself, the only bad thing is if something gets you (potentially) hurt/ injured. All else is for some but not all people basically – Raditz_35 Aug 21 '18 at 7:58
  • Unrelated 2nd comment: your goal "most caloric burn possible" could potentially hurt you. There are many people that lost weight too fast and now continue their life without their gallbladder. Use a 20% deficit max and that can be done via eating less alone. I can think of 2 exceptions: a) you are making money with your body (actor preparing for a role). Consider professional advice instead, it's your career. b) you want to eat as much as possible while still losing weight or similar. But then you have to eat what you have burned – Raditz_35 Aug 21 '18 at 8:04
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Delicate question. I am still trying to figurę out an answer for my own training.

What is clear for me is that combining the two during the same session is worthless. It does not bring any benefits endurance wise or strength wise EXCEPT if your sport requires such combination (CrossFit is the first example that comes to my mind). Then this is training for your sport setup/competition setup so that your body learns what it feels like. But this is not to induce adaptations.

Now the answer gets trickier if the question actually is ‘I train two times a day. Can I combine endurance and strength the same day and still get good adaptations?’

To answer, you need to go down the path reading current molecular physiology research. One of the first article I read that helped me is this one. You an also look for the textbook from Alex Viada ‘the hybrid athlete’.unfortunately, up to now, I still don’t have a yes or no type of answer.

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