Jailhouse rock
Collection of different fighting styles that have been practiced and/or developed within US penal institutions
- Type
- type of fighting style
Jailhouse rock (or colloquially 52 Blocks; abbreviated JHR) is system, or collection, of fighting styles that were practiced and developed within urban Black communities, commonly noted as being first mentioned in the 1960s and 1970s.
The many different manifestations of JHR share a commonality in blending western boxing with other stylized martial arts techniques. The basic principle of these styles is constant improvisation, blocks and effectiveness in real-life situations - Particularly, very tight spaces like a prison cell or a dark alley.
52 Hand Blocks has been referenced numerous times by contemporary media including by journalist Douglas Century's Street Kingdom: Five Years Inside the Franklin Avenue Posse, as well as numerous Wu-Tang Clan songs and Ted Conover's book Newjack. Recently, celebrities including actor Larenz Tate and rapper Ludacris have taken up the fighting system for film roles and self-defense, shining a brighter light on this previously underground martial art.
External links
Facts from Wikidata Q950057 (CC0); quoted introduction from English Wikipedia (CC BY-SA 4.0). Data retrieved 2026-10-22.
Data: Wikidata (CC0 1.0); Wikipedia (English) (CC BY-SA 4.0). Retrieved 2026-10-22.