Heart failure represents the physiopathological condition in which the heart is no longer capable of pumping enough blood for the tissue metabolism, or it can only do it by raising the filling pressure (vein pressure). The effort intolerance represents an almost universal manifestation of heart failure, and is defined by a drop in the effort capacity. The methods that are most recommended and used during physical therapy rehabilitation treatments for heart failure patients are the stationary bicycle exercise, treadmill exercise, or the mixed exercises, combining inside the same treatment the bicycle and the treadmill exercises. The experiment was conducted on a group of 100 patients, of which 57 men and 43 women, diagnosed with congestive heart failure. All the patients comprised in the study took the physical therapy treatment and were in a stable clinical state. The physical therapy sessions we applied to the patients were structured in three parts: warm-up part, fundamental part, and closing part. The physical therapy treatments applied to the studied patients were approximately the same, as the content was concerned, but the machines we used were three: - The treadmill; - The stationary bicycle; - Mixed (comprising treadmill and bicycle effort). The final results have shown an increase in the effort capacity of the patients, the initial test results being clearly inferior to the ones in the final tests. All three types of physical therapy protocols used in the study are effective, triggering an improvement in the general effort capacity of the heart failure patients.