Ocon, who switched to a Mercedes reserve role after losing his seat at Racing Point, undertook a packed simulator programme and would often have to dash from the factory to the track.
Ahead of his return to a full-time race role, Ocon admitted the past year had taken a lot of out of him.
"I mean, the season I had was very very demanding," Ocon said. "I was not sleeping for two days [at a time], it was quite crazy - the amount of travel I was doing, and the amount of hours I was doing in the simulator and then travelling to track, doing stuff for Mercedes. They used me well but a lot.
"So, I arrived, to be honest, after testing in Abu Dhabi, at my training camp [I was] the lightest I've ever been. I was destroyed basically, from the year."
Despite this, Ocon said he is "definitely" arri

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