World Champion Lewis Hamilton labelled his Friday practice as 'fun' as he topped both sessions ahead of the Hungarian Grand Prix.
Hamilton, a four-time victor at the Hungaroring, finished comfortably clear of Red Bull pair Daniil Kvyat and Daniel Ricciardo, with Mercedes team-mate Nico Rosberg seven-tenths down on the Briton.
"It was really good fun out there today," he said. "I'm starting to think this might be my favourite track. It's so fun to drive with the combination of corners and undulations.
"The way it all flows together just feels old school. It's incredibly hot, though - like driving in a sauna! You're drenched in sweat before you even get in the car with all the thermals on and I lost about half a kilo just in that session.
"It's a big challenge to get a good lap here in these conditions and I think everyone has struggled a bit.
"It's meant to be a bit cooler on Sunday which will be easier to cope with physically but will obviously change the balance a bit, so it should be interesting. Our car feels strong here though and I'm very happy with it so far."
Rosberg was less happy regarding his performance during practice.
"Today was a difficult day for me," he said. "I didn't ever really find the right balance, moving from oversteer to understeer.
"The long run pace was okay, so I can build on that. But I definitely have some work to do to improve my setup before tomorrow morning and get some practice in for qualifying during P3."