Shout out to all of our shredders out there! The DJ Firm is excited to announce that our official Shred415 workout mixes that you hear in-studio are finally available for download. You can find our ultimate workout mixes on Spotify and listen to them anytime, anywhere. Thank you to Shred415 for the partnership and listen to Shred415 class playlists, powered by The DJ Firm by clicking HERE. Do work. See Results. Listen to good music.