Each one has a warm-up, a real exercise table with work and rest times, a cooldown, and the sourced reasoning behind why it's built that way.
BEGINNER
A 20-minute bodyweight circuit built to be finished, not just attempted, with regressions for every move.
HIGH INTENSITY
Real work:rest intervals, including the Tabata protocol, and how to tell if you're actually training at HIIT intensity.
OUTDOOR
A five-station park circuit, where the format actually comes from, and what to check before you start.