You probably wouldn’t think that there was a whole that could be done to improve upon the rubber hex dumbbell short of just lowering the cost, right? That is to say, assuming that you select a reputable brand (one that permanently affixes the heads to the handles) they are a very affordable and durable dumbbell without much in the way of issues or complaints. The head shape is user-friendly, weight accuracy is better than cast iron, the ergonomic handles aren’t amazing but they are acceptable, and most importantly, the price is right.
For elite athletes food is fuel for performance. Their engines don’t run on empty. Most of the Crossfitters are too focued on what to eat, instead of eating enough and taking care of the simple basis: energy intake. To optimize your training and recovery start with the first stage of keeping your nutrition right: ensure you consume enough calories to replenish the calorie expenditure you obtain during and after your workout. Yes, prolong energy deficit (not consuming enough calories) leads to weightloss, but can also affect muscle mass loss, illness, overtraining and reductions in performance.
Sure, and Rich Froning isn't the best weightlifter to begin with. Mat Fraser weights 15# less than Froning and can outlift him in both lifts. Froning can still lift half decent numbers though and probably could lift a lot more if he only trained for those lifts, but where he's currently at definitely is plenty for him to excel in the sport. James Tatum (and other elite level US lifters) train multiple times per day, most days of the week. They spend all of their time refining technique and getting better. Froning probably spends 1/5 of the time on weightlifting training and still puts up decent numbers in the end, even when fatigued.