Easy Way to Remove a Stuck, Tight or Seized Cycle Pedal
I've read quite a few posts regarding the removal of a tight pedal. If you have access to a repair stand, this simple method works really well to remove the pedal without bloody fingers, mallets, blow torches or any lubricants.
Turn the bike upside down and lock the crank arm in the repair stand. The pedal and crank arm are now completely immobilized in the vise of the repair stand. Depending on the pedal, use a 15mm wrench or hex wrench (and perhaps a pipe for additional leverage) and even the tightest pedal will come off. Once off, grease up the new pedal and tighten while in the vise.
There is normally enough leverage to remove the other pedal without locking up the other crank arm. See the photo attached.