Srimad Bhagavatam Canto 10, Chapter 44, Text 03

 SB 10.44.3

aratni dve aratnibhyam
 janubhyam caiva januni
sirah sirsnorasoras tav
 anyonyam abhijaghnatuh
 
Translation: 
 
They each struck fists against fists, knees against knees, head against head and chest against chest.
 
Purport: 
 
The word aratni in this verse may indicate the elbow as well as the fist. Thus blows were perhaps also struck with the elbow, a technique seen today in various martial arts.
Srimad Bhagavatam Canto 10, Chapter 44, Text 02
Srimad Bhagavatam Canto 10, Chapter 44, Text 04