Study population
abuse of illicit or prescription drugs
MALNUTRITION
Eligible participants were adult patients (≥ 18 years old) who had undergone standard Roux-en-Y gastric bypass or sleeve gastrectomy 3 to 10 months before start of the exercise programme, currently not engaging in structured exercise, and literate in German. Volunteers with contraindications to exercise engagement, a medical condition likely to interfere with the normal conduct of the study and interpretation of the study results, evidence of malnutrition, planned pregnancy, or abuse of illicit or prescription drugs were excluded.