(Image credit: Nike x WIT)

I've been training my dad for just over six years, and over that time, I've encouraged smart investments for his home gym set-up, whether that's a new set of dumbbells, a grippy yoga mat, or what he wears on his feet.If you're lifting weights regularly, your training shoes matter, and a pair of the best cross-training shoes or weightlifting kicks is a great investment for protecting your body and form.During Prime Day, his favorite pair of Nike Metcon 5s just dropped to $89 at Amazon. Are they the newest iteration of the Nike Metcon shoe? Nope, not even close; there are 10.But I've tested many of the brand's shoes over the years, including the 8, 9 and hugely popular Nike Metcon 10, and I can tell you hands-down that the earlier models in the range are still some of my favorites today.Here's what you need to do to snap up this deal while stocks last.Nike Metcon 5 vs Nike Metcon 10

(Image credit: Nike x WIT)You can immediately see some key differences between the 5 and 10 in design, with the former rocking a wide, flat base and solid, chunky heel. I prefer to wear the Nike Metcon 5 for heavy weightlifting, particularly squats and deadlifts, where foot play is crucial and I feel like I have more space.Both shoes are cushioned and pliable with a soft forefoot to absorb impact if you enjoy plyometrics. Both models also use Nike's Hyperlift inserts so that you can adjust your heel-to-toe drop, which matters if you are really into your squats, wallballs, or general weightlifting but don't want a weightlifting shoe (read: cross-training shoes vs weightlifting shoes).