If performing training independently it is recommended to use the criteria listed in the following tables as guidance.

Tab. 1: Criteria to evaluate single sets/intervals
The physical load is appropriate if:
	self-perception according to Borg (respiration and exertion) is less than 7 at the end of a set no dizziness, discomfort or the like occur no feeling of pressure in or at the rib cage or head, no pinching pain or feeling of pressure in the heart area occurs no muscle or joint pain or the like saturation more than 90 (terminate exercise if saturation less than 88)
Reduce or terminate exercise when:
	One or several of the aspects listed above occur: termination of exercise or building in breaks which are long enough to ensure safe performance. In general, it is possible to perform the single sets distributed throughout the day instead of performing them all at once, especially when you have just taken up training again.
Start the next set, if:
	Sättigung mind. größer oder gleich 90 (ideal wäre größer oder gleich 95) saturation is at least 90 or higher (95 or higher would be ideal) self-evaluation according to Borg (respiration and exertion) is 3 or less respiratory rate(number of breaths taken in 10 seconds) is less than 5 breaks last 2 minutes minimum generally in a good state (relaxed muscles, breathing goes "all the way down" and easy)

Tab. 2: Criteria to evaluate the entire training unit ¹
Criterium		Evaluation	Consequence
	You hardly feel any physical exertion or fatigue. You could perform the same all over again without a break.	Physical underload hardly any training effect	one level up
	You feel older than usual, tired and you have heavy legs. You feel the need to rest. You feel that you have 'really' worked. Recovery period is relatively short and you quickly regain strength.		one level up
	Pressure on your joints You have aching muscles, other pain Increasing COPD symptoms (cough, sputum, breathlessness) Recovery period is long and you need a long time until you regain strength.	Physical overload possibly dangerous	one level down or skip a training unit

¹ Having an infection / an exacerbation: no training. The same applies to a period of time in which you are undergoing cortisone shot or if taking antibiotics.