In Formula 1, the neck is really important. There's a lot of force that's going to your head. We also have a helmet and it's not that light. When it's all about g-force, all of that extra weight in the helmet compounds and puts more and more pressure. To be able to maintain your head in a straight position - especially around the corners and while braking - you need to have strong neck. To train that, it's difficult.
The car is undoubtedly quicker and more balanced. The traction and braking can still be improved a bit but there's been a good evolution already from three weeks ago.