Selecting Cells in A Macro

I'm having trouble with a line of code in one of my macros. The code is as follows.

Selection.End(xlUp).Range("A1").Select
Selection.End(xlUp).Range("A1").Select
Selection.Offset(2, 0).Range("A1").Select
Selection.End(xlDown).Select

What I want is for the last line to highlight however many cells it passes over (Usually about 300) until it reaches the end of the section of cells. There is a blank row separating these cells from the data below. I cannot designate an amout because it changes.

Any help would be appreciated.

Thanks,
Sam