tough, I was considering it
I am on CKD and rugby training officially starts next thurs. I will either drop the CKD or pospone training for a week or so.
After Day 2 of week 3 on the CKD I trained back (post-workout consumed egg/flax shake), then did sprint training...only did 100m x 10 and 40m x 20 (sprints and strides) and I have never felt weaker or more light headed in my life.
I couldn't imagine performing at top level while on CKD. Unless you are a back, then you really don't do much but watch your forwards win the game.
Although, I suspect due to the intensity of 2 hour rugby sessions you could consume quite a few carbs pre and post and still reach/maintain ketosis.
I think if you eat sensible and put 100% into your workouts you'll drop that---if you skip the Thur and Sat night piss-up.
I always drop 10 or 20 pound, even more during 7s.
Not so good for me as I am a hooker and prefer to be at 220+.
What Div are you playing? Where (no need to tell me the team).
Good Luck.
Just imagine scrumming down with NO CARBS in your head or muscles...
Rugger