Thread: feeling the "pump"

ive read it all throughout the board people saying with the use of this or that or those product(s) that they feel a strong pump workin out.

this is going to sound like such a truly newbie question but what do they mean by that

After your workout, its the feeling that your muscle is Filled or.. "Pumped up", basically its the increased blood flow to whatever muscle you are working out, the increased blood flow makes your muscles appear larger as well, its only there for a limited time after your workout though.. always funny to see guyz hit a couple pushups before they get into a pool