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put one defensive player in each 10 meter zone for length of field
including the end zones. a lane say 10-20 
meters wide. 

give all your other players  rugby balls. put all of them at one end of
field. at back of end zone.  

using each other as obsctruction is not allowed.

on whistle all the ball carriers take off trying to score at other end
of field. whenever an offensive player is tackled he becomes a defensive
player. yes everyoone goes at same time.  

offensive players must touch ball down in goal to score. there is a
defender in end zone remeber. he can take player down and prevent him
touching ball down.  

the offensive players do not stop once they score. they go past back of
end zone and then try to score in the far end zone. 

they turn around and go to other end of field trying to score. whoever 
scores the most tries before all the players are tackled is the winner. 

everyone that doesnt score at least once runs hills, or something extra
of some sort. washes jerseys? :)

the groups then swap places. swap back and forth until had enough. 

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50 meter race. teams of 6. maul every 10 meters then sprint back to 
start. repeat 3-5 times. losing team runs lap or does pushups. 

all players must be involved in every maul. 

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touch rugby. all players have to jump to move around. no running or
walking.