Time has Come Today, the Chambers Brothers.
This version is shorter, there are much longer psychedelic versions, both have changes of pace good for workouts.
This song is older and different than any of the others noted.


I just said it in another thread and couldn't think of it here - Sly and The Family Stone

Also, if you're into blaxploitation, there are several intriguing soundtracks dating back to that era, such as Womack's "Across 110th street", Marvin Gaye's "Trouble Man", James Brown's "Black Caesar" or Edwin Starr's "Hell Up In Harlem".
Wow, my first post here in almost four years.
The 'Shadows', Cliff Richard's old backing band, did release some great up-tempo stuff in the 60's/70's, would be great stuff to out work on.

This threads got me going through my old stuff now. :)
Dunno about the era for the music but think these may be about right for style.
Umm how about some Sly and Family Stone, (esp' "if you want me to stay")
George Clinton (in various bands) def have a look at Parliement - We want the funk
Wilbur Bascombe and Zodiac - Just a groove in G
War - Low rider
Rosko - Peacemaker
The Soul Searchers - Ashleys Roachclip
The Jimmy Castor Bunch - It's Just Begun
The Headhunters - God Made Me Funky
Tears of a Clown - Smokey Robinson
rosko - Green onions
stevie wonder / Red Hot Chilli Peppers - higher ground
Ramsey Lewis - Back in the U.S.S.R
Ram Jam - Black Betty

Just saw this thread...
Slightly different from what other people are posting here, but you might like this: check out soundtracks from 1970s Bollywood movies, especially ones that have lots of instrumentals (from the car chase scenes, the fight scenes, etc).
E.g., the compilation Bollywood Funk is wonderful, and it looks like there are a couple other compilations that I don't have yet listed there....