Right hand is clenched, left hand is wrapped around or over right fist.
This is the general martial greeting of kung fu as well as many other martial arts styles. It is known as bowing. A greeting of mutual respect and peaceful intention. The right fist is a sign of rigorous practice and a strong and willing martial ability to defend or attack!
The covering of the open left hand is a sign of virtuous and disciplined wisdom or self-disciplined restraint.