Originally Posted by Frank Silbermann
Yes, running around your backhand leaves your forehand corner open. That's why the books I read when I learned tennis said, "Never run around your backhand. Instead, practice it until it is as good as your forehand."
I guess RH people get away with it against RH opponents because their opponents didn't follow that advice either (or they'd be able to smack the backhand down-the-line for winners).
If your LH opponent's backhand isn't so good, what you might want to develop is a killer inside-out backhand that you could use to pound his backhand after running around your forehand.
Yes that was the advice back in the day. But Classic inside out FHs can't be compared to Modern inside out FHs. After all there is a reason that the Pros go to this shot day in and day out. It is a critical part of the Modern game. The OP just needs to learn to hit it better against lefties.