Foremost: If you come up with a nice logo design with the the parts or even something entirely different than thats absolutely awesome. Put in some Inspiration =). The following is just something that comes into my mind:
This an example of a logo i could imagine:
An athletic /muscular person rowing on Rowing machine which is not specifially identifiable to brand. See below for details on rowing machines. Maybe the rower is made up of geometries (as seen in my design inspirations). Maybe even some geometries which depict the importance of proper rowing technique and anatomy. In the background or around the rower are hexagons in a honey comb manner to depict a biological, scientific touch i use. Maybe Honeycombs like thy are brushed?
Generell thoughts and ideas for the logo:
I like designs with hexagons (like the carbon ring), especially like honey combs. It gives a organic - biological look.
Also a DNA would depict the biological lookk
As I am a nature guy it should somehow feel natural (not necessarily depict a tree or grass or whatever) but it should underline the fact that its about natural movement, nutrition and lifestyle as well.
there should be a rowing machine (see below) and an athletic person rowing on it. The rowing machine shouldnt necessarily be identifiable for a certain brand.
I like a polished look as it might be on a clean surface.
Also my slogan "werde athletisch durch rudern" (means: become athletic through rowing) could fit below
The logo should look nicely on a T-Shirt or Sportswear Shirt.