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Here’s one caveat for you specifically: don’t train six days a week.

That's kinda straw-manning my point :) But to clarify, I wasn't strictly doing heavy weight for each of those days, and yes I could have taken it easier.

That's not really straw-manning when exercise-induced injury is the main point you are trying to make.

6 days a week of HIIT training, without enough time for your body to recover is a recipe for injury. Of course, this can vary from person to person and the intensity of the workout and the level of your experience and form - but these are things you didn't mention.

Point taken. To clarify, it wasn't always 6 days a week, that was an over-exaggeration by me. An average was maybe ~4.5 days a week, and some days were much lighter than others. I was maybe trying to communicate that I've invested in this kind of regime, and it's derailed the conversation away from the point I was trying to make.

HIIT is very specific, you’re talking bout going past your lactic acid threshold, they are very hard to recover from. So much so that it will stop you from other exercise. You wouldn’t even be thinking about lifting weights.

This would of course lead to injury. I don’t think anyone wants to squat heavy after sprinting.

Weightlifting is pretty safe when done right. Just make sure you have plenty of rest. At the same time, unrelated, but the posture benefits are way overrated. In fact, it’s gonna lead to bad posture over time unless you couple it with yoga or some sort of corrective stretching.

> This would of course lead to injury. I don’t think anyone wants to squat heavy after sprinting.

That's a fair call. Heavy weight training was usually on separate days, but I recall some crossfit WODs would include deadlifts alongside other fast-paced exercises, and now I question the safety of that. Those deadlifts were likely low weight, high-rep though.

You wouldn’t be developing joint pain if you took a couple days to rest and recover. That’ why your caveat is a non issue.

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