Sylvester Stallone's first boxing studio Rumble to open in New York

London: Action star Sylvester Stallone, best known for his portrayal of boxer Rocky Balboa in the 'Rocky' franchise, has invested in a new boxing studio named Rumble.

The 70-year-old actor is expected to make an appearance at the launch of the studio, reported Femalefirst.

Rumble, which is reported to be the "most anticipated group-fitness concept," will open its first studio in New York City.

It has already planned two more studio openings in New York City this year, with expansion on the West Coast of America already underway.