It’s helpful to include high-volume (popular) keywords such as “pilates.” But, keep in mind that “pilates” on its own isn’t specific enough and is too popular. And as a result, your content will probably not appear in the first page of Google (or even the tenth page, quite frankly). You’ll want to build on the keyword to gain more traction, such as “pilates instructors in St. Louis,” which will lead to more users who are ready to convert. It is also good to use low-volume (unique) keywords, such as “how pilates helps with posture”, which can be used for a blog topic.