In modern soccer the improvement or maintenance of the spesific endurance capacity of football players is achieved mainly by small sided games of various correlations, dimensions and constraints.
During games with 7v7, 6v6, 5v5 and 4v4 number correlations, players need to spend enough time to get into the 90-95% of M.H.R zone.
This zone exceeds the intensity of the match and as a result the player cannot withstand a long time in the production of output.
However, in this area and with the correct breaks, even greater endurance adjustments are achieved, with the components of VO2max, anaerobic threshold and running economy significantly improved.
In the following example you can see a football player participating in mid-range correlation small sided games where the yellow band represents the 90-95% of M.H.R and the red line the player's heart rate.