Consistent further development at the highest level

Just a few weeks after his sub-3 success at the Berlin Marathon stood for Gregor Gretz the next highlight: the Chicago Marathon on October 12, 2025.

And this time it went even faster. With a time of 2:55:27 hours, Gregor even ran significantly faster than in Berlin – and again under the 3-hour mark.

Progress in a short time

What makes this run particularly remarkable is the timing. There were only a few weeks between the two marathons – a phase that is normally used for regeneration in endurance sports.

Nevertheless, they managed to increase their performance significantly. The improvement of almost four minutes is a clear indication of very precise training control and exact coordination between exertion and recovery. As in Berlin, this run was also characterized by a constant pace and controlled race planning right up to the finish.

This combination of stability and targeted further development is anything but a matter of course in the marathon.

Chicago in the context of the World Marathon Majors

The Chicago Marathon is part of the World Marathon Majors and is one of the fastest courses in the world. Flat course profiles, often favorable weather conditions and a top international field make the race an ideal environment for personal best performances.

For Gregor, this race is also part of an overarching goal: to complete all the World Marathon Majors. With Chicago, he has taken another important step on this path – and with a performance that clearly underlines his own development.

Consistency and progression as a principle of success

The combination of the races in Berlin and Chicago impressively demonstrates what sustainable performance is based on: the combination of consistency and targeted progression. A stable performance basis makes it possible to exploit development potential in a controlled manner without the risk of slumps or overload.

It is precisely this ability to not only call up performance selectively, but to systematically develop it further, that is a decisive factor in the high-performance sector.

Parallels to data-based work at ^Datico®

As with the Berlin Marathon, it is clear that performance at this level is not a product of chance. It is the result of structured preparation, continuous analysis and the ability to make well-founded decisions based on data.

These principles can be found not only in endurance sports, but also in the ^Datico® environment. The management of health and performance is based on the same principles: transparency, systematics and the meaningful linking of data.

Conclusion

With his time of 2:55:27 at the Chicago Marathon, Gregor Gretz continues his consistent development and shows the potential that lies in a clearly structured and data-based approach.

The combination of two strong races within a short space of time underlines not only the individual performance, but also the quality of the underlying strategy.

We are looking forward to the next stages of the World Marathon Majors.