Study with Patients (40-60 participants) above the age of 65. There will be a comparison of regular training on ergometer (10 trainings within 2 weeks, 40 min each) to high intensity interval training on ergometer (6 trainings within 2 weeks, 25 min each). At the beginning and at the end will be a spiroergometer to measure the individual limits and vO2max, which will be compared amongst the two groups. To receive a subjective feedback, there will be a series of questionnaires at the beginning, after one week and at the end. The goal of this study is to get more information about whether a HII-Training is feasible with elderly patients and whether they can profit form it.

Inclusion Criteria:

• cardiopulmonal resilient
• able to sit on a ergometer
• knowledge of German written and spoken

Exclusion Criteria:

• Severe cardiopulmonary restriction (LVEF <30%, conduction abnormalities from AV block IIb or higher)
• Absolute cardiopulmonary contraindications (acute coronary syndrome, unstable AP -> not capable of rehabilitation), uncompensated heart failure (dyspnea at rest, orthopnea, severe edema)
• No ischemic events (cardiac, cerebral, peripheral) within the last 3 months
• Severe pneumatological underlying disease: COPD GOLD 3 and higher or status after exacerbation within the last 2 weeks, Asthma grade 4
• Dyalisis reliant
• Severe psychiatric disorder (severe psychosis, severe depression)
• Distinct dementia