One of the main reasons to workout is so you’ll have more energy to go and do the things you enjoy doing, and you’ll be physically able to do so.
This is all well and dandy, but there is a flip-side to this: you may end up working out, over extending yourself, and then you’ll have no energy or desire to go and do the things you want to do.
This is me most of the time. For example, let’s take HIIT classes. Every time I do a high-intensity interval training class, I get my ass kicked. I burn a ton of calories, get in a great workout, but then I’m tired, and depending on the time of day I workout, I either have to take a nap or go to bed just to recover. I don’t feel at all like doing much else — and this is really starting to piss me off.
Then, throw in the fact I perpetually seem to be injured. Right now, I’m fighting plantar fasciitis, which is not all that fun. This means I’m taking more time off from running, which just pisses me off too.
I’m still trying to find a workout program and workout schedule that will leave me energetic but not exhausted and leave me injury free.
My Journey to the CrossFit Games 
I think the reasons are overblown— and therefore we tend to over do it! If you read mark Sisson’s first book (the primal blueprint) he talks about this a lot—you can be lean and strong with about three workouts a week—one lifting heavy, one sprinting, and one gymnastics training. pepper in between those workouts some long walks. The fitness industry is just that—in it for our money, and we have to have the wisdom to know what is the right fit/combination for ourselves.
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