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right in front of the seat and I got a couple of those clamps that can convert to stretchers and placed two pieces of 2 inch wide and about 18 inches long on either side of the keel line and placed a small board on top of them. another board under the thigh braces and the stretcher in place to push the hull back out into shape.
Next, a propane heater underneath the boat about a foot and a half away and slowly heat the hull to hot to the touch and you can use a heat gun inside to try and match the outside hull temperature. When it heats up stretch the hull out to original shape and let it sit there for about 30 minutes (I never let the plastic get over 190 degrees) Then turn the heat off and come back tomorrow.
Note you might have to do this a couple of times if that plastic has been dented or deformed for a long time.
your mileage may vary