No, a very big NO, sir. Wear one and then start posting. They don't slow you down or constrain movement in a way everybody envisions (important fact is that that depends on the level of craftsmanship). You'll tire more quickly but not as fast as you'd think. Having the weight distributed in a right way is a lifesaver.Teddy Roosevelt said:No matter where those 70 pounds are, those are 70 pounds that will slow you down quite a bit.