I pulled something in my back when I was doing some abdominal crunches in training and I had to go and see an osteopath. It was fascinating because he pointed out loads of things I didn't even know were going on in my body; areas I can improve on.
It has opened up a new spectrum of fitness and made me wonder whether I need to expand my physical team.
I have a new diet, too, and at the moment I feel great on it all. I'm trying to get down into the details even more than in the past.
It is hard for people who don't do it to appreciate just how physical it is driving an F1 car. The drivers are used to it, but we do have to train really hard.
Because of the position we are in when we are driving, the strain is on different parts of your body.
I didn't know until just recently, for example, that my left hip flexor muscle is my weakest point. I thought I had a pretty strong butt! But I have to strengthen it up because it affects all sorts of other muscles.
I have always worked hard on this, but now I have taken another step in how I can make things even even better.
Aiming for more wins
All in all, it has been a really productive summer and arriving in Spa on Thursday morning, I just felt great.
I was able to go in the simulator and try out some of the new parts we have for this race.
The simulator has been developed a bit since I last drove it, and that feels good because I feel I've been a part of where it's now beginning to go.
I have been able to point out some aspects that it was missing and it's great to feel that some of the suggestions I have been able to offer are now coming on stream.
I feel we are in a good position as a team. We have a good car and we should be competitive but we have to take it one race at a time.
The championship is always in the back of your mind, but you never know what's going to happen on any given weekend. I come here to Spa wanting to win more than ever but it's about managing expectations.
We have a good car so we should be competitive and that gives me a great feeling because I know if I'm at my best I should be able to eke out even better results.
But I don't think I'm
main challenger in the championship, as some people are saying.
I come here knowing Ferrari have probably made a step.
is going to be competitive and
of Lotus is going to be hard work as well.
I still feel Sebastian's Red Bull is the best car. So they are going to be tough to beat, but I don't feel it's impossible.
Spa - one of the great races
Spa is a cool place. The track is spectacular and if the weather is good, as it was on Thursday, it's a really nice place to be.
F1: What makes Spa so special?
It's quite chilled. It's not an intense weekend, generally. It's like a real race weekend you would have back in the day.
There's no crazy media demands, or massive amounts of guests. It's just a real race weekend.
Monaco is the glitz and glamour;
this is just a pure race track. I really like that.
Lewis Hamilton was talking to BBC Sport's Andrew Benson.
Belgian Grand Prix, day one
Friday 23 August: First practice at 08:55 BST, plus live text commentary online. Second practice at 12:50 BST on BBC Two plus live text commentary online
Belgian Grand Prix, day two
Saturday 24 August : Final practice at 09:55 BST on BBC Two, plus live text commentary online. Qualifying at 12:10 BST on BBC One plus live text commentary online
Belgian Grand Prix, day three
Sunday 25 August: Race coverage at 12:10 BST on BBC One & BBC Red Button at 13:00 BST, Radio 5 live, plus live text commentary online. F1 Forum, 15:15 BBC Red Button (IPTV only). Highlights, 19:00 BBC Three & BBC Red Button
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