These are my measurement directly before my butt building strength training workout (exercises listed in my last post). I gained at 1/2 inch "pump" after my workout.
So what is muscle "pump"?
It's that tight, full feeling you get after training muscles. Blood is pumped to your muscles to give your cells the energy
they need to fuel your workout. The pump is the blood and other products pooled in your muscles. Muscle pump is a good indicator you've effectively targeted that body area and with proper diet should experience muscle growth over time. To get that muscle growth you need to be progressively moving up with weights and doing the right exercises to target those muscles.