If you've ever worked with a fitness trainer, you probably know that they're a wealth of knowledge when it comes to health and wellness. On a regular basis, they get asked popular questions like, “Do women get bulky if they lift heavy weights?” or, “Will my sleep quality suffer if I work out at night?” Here, get the science-based cheat sheet to these and other common fitness questions that Medcan trainers are asked every day. (pictured: trainer Sean Trotman)