Watch Metallica warm up in tiny room before stadium concert
Courtesy of CBS News

Even when you're one of the biggest bands in the world - big enough to play stadiums - you know better than to go on stage cold.  For Metallica, currently sweeping the nation on their WorldWired Tour, their pre-show ritual includes prepping in an intimate setting.

In an interview with CBS News, the veteran hard rockers explained their process.  Says drummer Lars Ulrich,  "About 30 minutes before the show, we go into the room that's called the 'tuning room.' Adds lead singer James Hatfield, "And we're just, you know, knocking the rust off."

For a band who once rightly earned the nickname 'Alcoholica,' it seems they're taking better care of themselves these days, mostly out of necessity.  Traveling with a physical therapist, Hetfield explains, "Now that we're old...54....we got a guy that stretches us out."   

Metallica continues on their North American tour through mid-August, kicking off a European tour at the beginning of September. 

Watch their pre-show ritual above.

Metallica WorldWired tour dates:

Aug. 4 - Phoenix, AZ - University of Phoenix Stadium
Aug. 6 - San Diego, CA - Petco Park
Aug. 7 - San Francisco, CA - Metallica Night w/ the San Francisco Giants @ AT&T Park
Aug. 9 - Seattle, WA - Centurylink Field
Aug. 12 - San Francisco, CA - Outside Lands at Golden Gate Park
Aug. 14 - Vancouver, BC - BC Place
Aug. 16 - Edmonton, AB - Commonwealth Stadium
Sep. 2 - Copenhagen, Denmark - Royal Arena
Sept. 4 – Amsterdam, Netherlands - Ziggo Dome
Sept. 6 – Amsterdam, Netherlands - Ziggo Dome
Sept. 8 – Paris, France - AccorHotels Arena
Sept. 10 – Paris, France - AccorHotels Arena
Sept. 12 – Lyon, France - Halle Tony Garnier
Sept. 14 – Cologne, Germany - Lanxess Arena
Sept. 16 – Cologne, Germany - Lanxess Arena
Oct. 22 – London, England, U.K. - The O2 Arena (click here for tickets)
Oct. 24 – London, England, U.K. - The O2 Arena (click here for tickets)
Oct. 26 – Glasgow, Scotland, U.K. - The SSE Hydro
Oct. 28 – Manchester, England, U.K. - Manchester Arena
Oct. 30 – Birmingham, England, U.K. - Genting Arena
Nov. 1 – Antwerp, Belgium - Sportpaleis
Nov. 3 – Antwerp, Belgium - Sportpaleis
Feb. 1 – Lisbon, Portugal - MEO Arena
Feb. 3 – Madrid, Spain - Wizink Center
Feb. 5 – Madrid, Spain - Wizink Center
Feb. 7 – Barcelona, Spain - Palau Sant Jordi
Feb. 10 – Turin, Italy - Pala Alpitour
Feb. 12 – Bologna, Italy - Unipol Arena
Feb. 14 – Bologna, Italy - Unipol Arena
Feb. 16 – Mannheim, Germany - SAP Arena
Mar. 27 – Herning, Denmark - Jyske Bank Boxen
Mar. 29 – Hamburg, Germany - Barclaycard Arena
Mar. 31 – Vienna, Austria - Wiener Stadthalle
Apr. 2 – Prague, Czech Republic - O2 Arena
Apr. 5 – Budapest, Hungary - Sports Arena
Apr. 7 – Stuttgart, Germany - Schleyerhalle
Apr. 9 – Stuttgart, Germany - Schleyerhalle
Apr. 11 – Geneva, Switzerland - Palexpo
Apr. 26 – Munich, Germany - Olympiahalle
Apr. 28 – Krakow, Poland - Tauron Arena
Apr. 30 – Leipzig, Germany - Leipzig Arena
May 2 – Oslo, Norway - Telenor Arena
May 5 – Stockholm, Sweden - Ericsson Globe (click here for tickets)
May 7 – Stockholm, Sweden - Ericsson Globe (click here for tickets)
May 9 – Helsinki, Finland - Hartwall Arena
May 11 – Helsinki, Finland - Hartwall Arena