Conclusions
The present study provides the first evidence that 12 weeks of PEBs with coordinative exercises and with a low training volume and a variety of juggling exercises performed at the workplace result in changes in GM volume and sulcal depth. These changes were found in brain structures strongly implicated in visuo-coordinative processes involving hand and arm movements. Future research in this field would benefit by the use of different brain imaging modalities. In particular, the assessment of magnetic resonance spectroscopy in the context of physical exercise could also provide important new insights into the biochemical and cellular mechanisms underlying the observed changes in brain volume.