Nico Hulkenberg admits he may need to hit the gym before launching a race career in Indycar.
The 34-year-old German lost his full-time Formula 1 seat at Renault at the end of 2019, subsequently racing as a one-off substitute at Racing Point before signing as Aston Martin's 2021 reserve.
But he has now appeared at the Barber road course circuit in Alabama for a test with McLaren's Indycar team.
"He has a lot of catching up to do," observed Auto Motor und Sport correspondent Philipp Koerner, after Hulkenberg was slowest of the five drivers present.
Hulkenberg said: "It was a good and successful day for me.
"But I can definitely confirm that these monsters are very difficult to drive. I probably need to go the gym more often," he smiled, presumably referring to the lack of power steering.
"In the morning I needed some time to feel comfortable in the car, but in the afternoon the laptimes and my performance got better."
It is reported that McLaren wants to add a full-time third car to the Indycar category in 2023, but could offer drivers like Hulkenberg some one-off outings next year.