Everyone has individual needs when it comes to footwear. Just getting "running shoes" won't cut it for the gym. Like anything - there are specific shoes for the situation.
For the gym, we want as flat of a shoe as possible. We also don't want anything too soft. This is be ause you're lifting heavy weights and we don't want the shoe collapsing underneath you forcing the wrong muscles to work at the wrong time.
We want a stable base to press off of. Running shoes have different levels of support in different areas and they're meant to reflex when you hit the ground - this is the opposite of what we want with lifting and controlling weight.
*One exception are minimalistic shoes like New Balance Minimus. Although they're very flat, they'renot a super stiff sole. That's ok in this case because you have more contact with the ground which is stiff as hell!*
What About Weightlifting Shoes?
Great question, weightlifting shoes are great for Olympic weightlifting as they're super stiff, offer lots of support and have an elevated heel which can help get lifters in a deeper position and more conducive to maintaining a vertical bar path.
But guess what?
If you're not an Olympic lifter, you shouldn't be using them. They can mess with your ankle mobility and the general population needs A LOT more ankle mobility.
So What Are Some Great Gym Shoes?
We love Nike Metcons and New Balance Minimus. Although they're not the only great gym shoes. man people love wearing Chucks because they're flat soled and hard. There are even more specific gym shoes we haven't tried yet so it's tough to recommend.
Moral of the story is: find a pair of flat soled shoes with support or something minimal that's as close to the ground as possible.
Ditch your running shoes and high school gym shoes that you've been wearing for 10 years. Get some real training shoes and get serious about your results!