Now 5th year in CrossFit, I agree that reducing carbs to 100 grams (not counting fibre) has always dramatically reduced my pains and aches, and has also increased my workout performance. I think increased workout performance is due to body feeling much better in general. It improves sleep as well. I increase my healthy fat (nuts, eggs, cheese, olive) and not protein (keep it to 130-140 grams) when reduce carbs.

Also when controlling carbs, I make sure I eat carbs which have low GI. I try to have high GI carbs only 1-3 hours before the workout, or night before if workout is early morning, so that they get burned.

When not controlling carbs, my carb intake is over 200 grams. And this generally does bring back aches and pains and affect workouts as well. But in general I eat and drink everything, I like all sorts of foods, many of which are considered junk foods, but eat them in moderation and always balance them out. End of the day I always make sure I have taken 40% carbs, 30% fat and 30% protein for the day when not controlling carbs; or 20% carbs and 50% fat maintaining protein to 30% when controlling carbs.

Fantasic.  My n1 experience shows lower carb (processed and natural) decrease my aches and pains and my energy increases.  Love seeing varying views on health and nutrition. 

Please stop promoting a low carb or keto diet. While it can be beneficial for a short time for certain individuals, it should not be followed long term, especially in athletes and women. As a certified nutrition coach and someone who experimented with low carb, I can say it will wreck your metabolism. We need carbs. While we shouldn’t eat a standard American diet full of grains and insufficient protein, we shouldn’t be afraid of fruit, tubers, rice and properly prepared grains. Also, keep in mind that most of the studies on keto are short term and only include men. The ones that do include women do not show the same benefits for women. We need carbs for a healthy cycle. 

He’s essentially saying you should cut out the majority of fibre from your diet. That’s not a good idea. 
Also, how does he suggest athletes get adequate protein? As when protein is consumed in adequate amounts will knock you out of ketosis. 
I really cannot understand the CrossFit philosophy of low carb for so many reasons. 
Yes it may have a place in individuals in a diseased state, but stop promoting it for the general public. It’s irresponsible 

Please start explaining what you mean when you say carbohydrates - it's to broad as a term. Not defining it is just lazy and irresponsible.