It's important that you familiarize yourself with the weights, machines, and tools that you buy for your home gym, Dr. Carter said. If the equipment doesn't come with an instruction manual, she recommended going to the internet. Again, make sure you're vetting the website or person you're receiving the information from, but you can also phone a friend. "Who did you hear about it from in the first place?" Dr. Carter asked of whatever machine or equipment you now have. "How do they use it? How did they learn? I think that we are all so much more connected that it's easier to sort of crowd source questions like that." Use discretion, but also use common sense.