This is as much for reference as anything else. It is quite difficult to go into too much detail without revealing your actual source. A press release for the fair in English (not a direct translation of the German press release, but closely related) refers to this "course" or "facility" as a "pilot project". I can send you a link to this privately if you haven't already seen it.

Here is something very similar, although the term in the German original is "Pilotparcours":

As part of its sustainability strategy, the state government of Hesse, together with three universities, initiated model movement trails for older citizens at two pilot locations, Darmstadt and Hanau. These trails were scientifically supported and monitored by the three universities. The pilot trails were constructed in summer 2011 with the aim of motivating senior citizens to enjoy movement in the fresh air that would also make them healthier. For the first time in Germany, for three months and within the framework of an academic study, research was carried out into the positive effect of movement trails on the health of those senior citizens over 60 years of age who did not previously engage in sport. The findings of both the physical and psychological evaluation of the senior citizens taking part can be viewed as positive.

The pilot trail of this type funded by Hesse’s ministry for social affairs was established in the Schlossgarten in Hanau. There are also public movement trails for athletes and the physically active with ambitions. Here even those less keen on sport can be motivated by supervised exercise. A movement trail of this kind was set up as a pilot trail in Darmstadt’s Bürgerpark and is used by athletes and guided exercise groups.

Im Rahmen der Nachhaltigkeitsstrategie hat die Hessische Landesregierung zusammen mit drei Hochschulen modellhaft Bewegungsparcours für ältere Mitmenschen in zwei Pilotstädten, Darmstadt und Hanau, initiiert und wissenschaftlich durch die Hochschulen begleiten lassen. Die Pilotparcours wurden im Sommer 2011 vor dem Hintergrund errichtet, Senioren zu gesundheitsfördernder Bewegung an der frischen Luft zu motivieren. Erstmalig in Deutschland wurde drei Monate lang, im Rahmen einer akademischen Studie, der gesundheitsfördernde Effekt von Bewegungsparcours auf bis dahin sportlich nicht aktive Senioren
über 60 Jahren geprüft. Sowohl die Ergebnisse der physischen als auch die psychischen Auswertung der Probanden können als positiv bewertet werden.

Der vom hessischen Sozialministerium geförderte Pilotparcours dieses Typus wurde im Hanauer Schlossgarten eingerichtet. Es gibt auch öffentliche Bewegungsparcours für Sportler und ambitionierte Aktive. Hier können durch ein Angebot betreuter Übungsstunden auch weniger Sportliche zur Nutzung der Geräte motiviert werden. Im Darmstädter Bürgerpark wurde solch ein Bewegungsparcours als Pilotparcours eingerichtet, der von Sportlern und angeleiteten Übungsgruppen genutzt wird.
http://www.playground-landscape.com/media/issue/132/attachme...

A more recent edition of the Playground@Landscape magazine discussing this fair refers to a "Referenz-Outdoor-FitnessParkour", translated as "reference outdoor fitness trail" .

Wikipedia - Fitness trail
A fitness trail (more recently known as outdoor exercise equipment and also known as a parcourse) consists of a path or course equipped with obstacles or stations distributed along its length for exercising the human body to promote good health.
https://en.wikipedia.org/wiki/Fitness_trail
Ein Trimm-dich-Pfad ist ein Rundkurs, bei dem sich etwa alle 200 Meter ein einfaches und robustes Turngerät befindet.
https://de.wikipedia.org/wiki/Trimm-dich-Pfad

Examples in English:

Health Minister Edwina Hart has announced almost £50,000 of funding to install fitness trails in the grounds of two Welsh hospitals.
The outdoor schemes are being piloted at Nevill Hall Hospital, Abergavenny and Ysbyty Alltwen, Tremadog to promote healthy lifestyles to NHS staff.
http://www.wales.nhs.uk/sitesplus/993/news/14271

Some authorities have experimented with ‘gyms without walls’, ‘trim trails’ ...
UK-based community-wide physical activity programmes, such as the healthy towns programme33 and local exercise action pilots34 can be hugely successful
https://www.gov.uk/government/uploads/system/uploads/attachm...

Our fantastic new outdoor Fitness Trail is now open.
https://www.edgehill.ac.uk/edgehillsport/facilities/fitness-...