At my dojo we practice Randori, and for the most part it is very enjoyable, but exhausting. Anyway some members feel it is a waste of time.

For those not familiar with the term randori it is continuos self defence against multiple attackers for a set time ie (15min) we have to take the attack to a submition or use some sort of finishing technique. Each attack is different you can use any defence you want and the attacker does not know what is coming his way eather.

What do you think, useful or waste?