To get the idea of what 3 - 5 pounds would feel like as a shield on yer arm, take a kitchen chair and bind it to your arm. Granted, the legs & back will make it very ungangly, but it should give you the idea of what 5 pounds feels like on your arm.
You could also go into the gym and bind a 5 lb. weight to your arm, but with it being metal and so small, it may not give you the effect of area spreading out the weight which can make a huge difference in the feel. Kinda like a 5 lb. claymore v. a 5 lb. long-sword (damn heavy longsword) - the long sword could easily be a 1 hander, but with the length of the claymore, it's gonna be very hard for a dude with less strength than Dolph Lundgren to wield with 1 hand.
To get the feeling of what a sword would feel like in combat, take one of those nerf weights used in aerobics classes and start swinging it around your head & torso. See how long it takes to work up a sweat. Or, go out back and pick up the axe and start splitting the cord of wood --- then pick up the aul and continue splitting - give you the idea of what a 2 - 3 lb. axe going through shield and armour would be like and how tiring it can be + what an 8 lb. sledge / mace / war-hammer would be like going through the same shield and armour. Gets lots of aggression out too *big evil grin* = free work-out & you get the added benefit of an expanding chest & boulder shoulders.
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<ul>
<li><a href="http://ghlbeyerlein.tripod.com"> My web site</a>
<li> <a href="http://stations.mp3s.com/stations/358/grutos_metallipage.html">My MetalliStation</a>
<li><a href="http://www.grid.org/projects/cancer/"> United Device's distributive computing Cancer Research Project</a>
<li><a href="http://www.firstgov.gov">FirstGov.gov</a>
<li><a href="http://www.tsa.gov/public/index.jsp">TSA.gov</a>
<li><a href="http://www.whitehouse.gov/homeland/">Homeland Security</a>