text: 3.3 An engaging environment 
  
  It was somewhat distressing during the last interval, as my feet 
  were not working, and I did not know what to do to increase my 
  heart rate—when I could not run or walk quickly anymore. 
  (ID2, EDSS: 2) 
  
  their performances were 
  positively inﬂuenced and motivated by the group setting, 
  for 
  example, through cooperating in exercises with balls, seeing other 
  individuals in the group who were “doing well”, cheering each 
  other and competing when running and walking next to each 
  other. However, one participant emphasized that observing 
  people with visible disabilities from MS was distressing, as it 
  revealed negative thoughts about one’s own future. 
  It was 
  emphasized that mastering challenges in the group sessions 
  added more meaning than doing the same alone: 
  
  Most participants reported that 
  
  The focus on the core or the middle of the body in the detailed 
  exercises was stated to improve participants’ PA performance; 
  participants described being less clumsy or unsteady or walking 
  without holding on to the walls. Having practiced the detailed 
  CoreDIST exercises 
  indoor group beforehand was 
  described as a helpful and pertinent preparation by some 
  participants, as it was regarded as more difﬁcult to accurately 
  execute the exercise techniques outdoors due to their higher 
  intensity, the uneven surface, or bad weather. Some participants 
  commented that the standing exercises (in-between the running/ 
  leaving their legs 
  walking intervals) required too much effort, 
  tired for running afterward. 