Aqara Smart Lock U100 Kit is going for $149.99, and if you have an iPhone or Apple Watch, this one is pretty easy to picture on your door. Instead of digging around for keys, you just walk up, tap ...

Loren Brutsch is a writer and editor for Health.com. She has a master's in publishing, is a certified personal trainer, and has over six years of experience in strength training and bodybuilding.