Okay, so athleisure is basically a type of clothing that you can wear both for exercising (like when you run or play sports) and for just hanging out or going places (like to the store or to see friends). It's really comfortable and often has stretchy materials, like yoga pants or sweatpants, that can move with your body. But it's also stylish and trendy, so you can look cool and feel good while you're wearing it. It's like you're ready to work out, but also ready to have fun!