Cardiovascular training significantly increases VO2 max, while calisthenics and stretching do not show significant VO2 max increases over a six-month period.

“they observed as one would expect a significant increase in V2 Max in the individuals that were assigned to the group that did cardiovascular training but they did not observe a significant increase in V2 Max in the individuals that did three 1 hour per week sessions of calisthetics and stretching across the six-month period”