Alonso heads into Sunday's German Grand Prix with a 13-point lead over Red Bull's Mark Webber, whilst reigning champion Sebastian Vettel and Lewis Hamilton are 29 and 37 adrift respectively.
Without doubt Alonso has been at the top of his game, pulling a struggling Ferrari up by its bootstraps to extract performance when many feared at the start of the year it would be a dud.
With the Spaniard currently on a run of 21 races in the points, just three shy of Michael Schumacher's all-time record of 24, Alonso feels he is physically better than ever.
"Physically this is my best season because in previous years - you didn't know - either my leg, my shoulder or something had pain, or I didn't have good preparation," said Alonso.
"So far this year, all 10 races, I have arrived at every race 100%, which has been good.
"I always work very hard. Obviously we don't go to an office for eight hours a day, we just need to train.
"I do four or five hours training per day, which I enjoy because I love the sport, so it's a lot of training.
"But this year I am in the best condition of my career."
That has been reflected in Alonso's performances as he is one of only two drivers to win two races this season and has been on the podium on a further three occasions.
The 30-year-old, however, is growing concerned at Red Bull's new-found pace and form as Vettel was cruising to victory in Valencia until an alternator problem ended his race, whilst Mark Webber was on the ball to win the British Grand Prix 12 days ago.
"Red Bull has been a little quicker than everybody else, not for just the last two or three grands prix, since Bahrain," added Alonso.
"In the last six grands prix they have had pole position in four, so they are definitely a little ahead in terms of performance and so we need to catch up."
Alonso, though, cannot fault what he has achieved this season to give him the edge in the title battle as he looks to add to those he won in 2005 and 2006.
"It's true the factors involved in this championship so far have been good for us," said Alonso.
"I made a mistake in qualifying in Australia, but apart from that I probably wouldn't change too many things I've done so far.
"This is good news because you always have mistakes here and there."