The Grüneburgpark is located between the Palmengarten, the Campus Westend and the Botanical Gardens in the Westend of Frankfurt.
My friend once said she has only seen this many runners at the marathon. This really is one popular place for sporty people.
They will pass by the former orangery which was turned into the pretty Georgios church. Stop for a coffee at the Park Café. Since the university is very close-by, there are many students and sun worshippers on the extensive patches of grass.
During the warmer months, one of my yoga teachers invites to practice yoga inside the pavilion at the Korean garden. It is a very humble experience to do yoga outside, especially in a busy city like Frankfurt. Give it a try!