Apr.12 (GMM) Lewis Hamilton was back at work with Mercedes on Friday.

Lewis Hamilton, Mercedes AMG F1
Lewis Hamilton, Mercedes AMG F1

Photo by: XPB Images

On Thursday, the 2008 world champion sat out his media, sponsor and team commitments in Shanghai to recover from symptoms of allergy.

But the 28-year-old was at work on Friday for the two ninety minute practice sessions ahead of the Chinese Grand Prix weekend.

"Feeling much better today, thanks," Hamilton told his supporters on Twitter before arriving at the circuit in the morning.

Hamilton was second fastest in the morning session, behind his teammate and 2012 Shanghai winner Nico Rosberg.