What do systematic reviews say?

Exercise vs no exercise

Exercise showed no clear difference in ICD, inappropriate shock ( compared with no exercise at the end of the intervention (moderate certainty).

• Exercise‐based cardiac rehabilitation for adult patients with an implantable cardioverter defibrillator 2019 · Cochrane Headline outcomes only
  RR 0.6 [0.1, 3.51]
  1 study · 160 participants
  Moderate