Ballet-teaching and aerobics doesn’t seem like a natural pairing, but this superior-energy video proves it’s achievable, and the result is actually a stable training. Kym Perfetto Although her Instagram feed is filled with badass biking pictures, cycling is just some of NASM-certified coach Kym Perfetto's YouTube content. (Whilst, exciting fact, https://www.youtube.com/watch?v=EVvj23lAPDQ