The Northwestern Medicine study analyzed 150 adults, ages 18-89, who recorded in their smartphones how much their exercise each day and also their alcohol consumption for 21 consecutive days at three different periods during the year.
Lead author David Conroy said from Monday through Wednesday cut back on alcohol consumption, but once weekend approaches, physical activities increase and so as alcohol consumption.
Both physical activity and alcohol intake increased from Thursdays through Sundays.
It was also noted that beer was the most popular post-workout alcoholic beverage.
Researchers said further studies will help determine what drives people to drink more on days they exercise more.
Although that also pointed out several theories that could be the reason why there is link between drinking and physical activity.
They said the reasons could be people after their workout may want to reward themselves for staying active; people have more free time during weekend to enjoy things other than work; or some mistakenly thought alcohol as a good way to replenish fluids.