I have started playing volleyball recently, and I fully admit I don't know the rules of the game in great detail.
Recently when we were playing, one of us played the ball with their leg and then another player continued the rally. Is this a foul?
According to one LiveStrong.com page discussing legal and illegal volleyball hits:
According to another site, volleyball rules state:
Finally, from the official USA Volleyball site, the 2009-11 US domestic indoor rules state:
Similarly, the 2011-12 FIVB international rules state:
So for all major indoor court competitions, rule 9.2.1 permits hits by any part of the body.
For beach volleyball, FIVB has a similar rule in the 2009-12 rules:
So by the currently available rules, players can legally hit the ball with any part of the body.
Yes It is allowed. But of course not always allowed.
You can kick the ball to stop the ball from hitting your side.