Calisthenics, core shit, and cardio. That's all it was really. I mean it's okay...but I highly doubt that's what he does normally. Also by "robert's workout" I had no fucking idea who this was about prior to clicking it.
I'm sure Whittaker lifts weights and does oly shit, runs sprints, does road work, swims. Obviously he's wrestling/grappling/sparring and that's the bread and butter for him considering he's an MMA fighter.
GQ is a joke, that should by the main takeaway. Obviously some random actor or athlete isn't about to do a high intensity deadlift session or full sparring day for GQ, it's just a photoshoot really. This shit was probably geared towards people without gyms/weights for the pandemic as well.