The club was founded in 1947 as
Muscelul Câmpulung and played for sixteen years in the Regional Championship. Muscelul, coached by
Jean Lăpușneanu, promoted in
Divizia C at the end of the
1962–63 season after finishing as runners-up in the
Argeș Regional Championship. Muscelul finished last in the
1963–64 season, spared from relegation due to the expansion of the third division. Followed three more seasons in the third tier of Romanian football in which was ranked 9th in
1964–65 season, 7th in
1965–66 and 13th in 1966–67, thus relegating in the Regional Championship. Muscelul finished second in the 1967–68 season of the
Argeș Regional Championship and promoted to
Divizia C. After finished 11h in
1968–69 season in the third division, the club was renamed as Unirea Câmpulung for
1969–70 season, but relegated after was ranked 15th in Series IV. Following relegation, the club reverted to Muscelul name went on to won the
1970–71 Argeș County Championship made a quick comeback to Divizia C. Their stay in third division was short-lived, as immediately relegated back to the
County Championship after finished 13th at the end of the
1971–72 season. The first time they played in
Divizia B was in the
1977–78 season when they barely avoided relegation, in the following one they finished on the 9th place and in
1979–80 they relegated back to
Divizia C after finishing on the 15th place. Muscelul returned to the second division after winning Series VI of Divizia C at the end of the
1984–85 campaign, under the guidance of coach
Vasile Stan. The squad included Popa, Istrate, Stoica, N. Iosif, Lungeanu, Miuțu, Nae, Păun, Predică, Necula, Berevoianu, S. Iosif, Oiță, Pescaru, Vlăsceanu, Apostol, Pamfil, Coman, Grigoriu, Moț, and Preda. In
1985–86, Muscelul competed in Series II of
Divizia B under Ion Voica, who took over after eleven rounds, with Stan remaining as assistant, but the team was relegated after finishing in 15th place by the end of the campaign. followed by
Iulian Tameș and
Iulian Vladu among others. However, the
2019–20 season was suspended in March 2020, due to
COVID-19 pandemic in Romania with Muscelul finishing in 3rd place. In the summer of 2020, it was renamed Inter Câmpulung and finished the
2020–21 short season 3rd in Group B of the
Liga IV – Argeș County. In the
next season,
Muscelenii fought for promotion, finishing in 2d place one point behind
CS Rucăr. In 2022, the club was renamed again, this time as
ARO Muscelul Câmpulung. ==Honours==