"Every Monday, I used to exercise with my friends."
Translation:Tous les lundis, je faisais du sport avec mes amis.
I did, and they have accepted it. 2020 June 25
("Each Monday" is, strictly speaking, "chacun des lundis", no?
I haven't tried the literal translation "faisais de l'exercice" (used to get exercise) though, exerçais being more like "used to exercise" (exercise itself as a verb) in English ("apply a faculty, right, or process").)