How to improve your muscles in 4 easy steps:
1. Stand on a comfortable surface, where you have plenty of room at each side.
2. Hold a 5-lb potato sack in each hand, extend your arms straight out from your sides and hold them there as long as you can.
Try to reach a full minute, and then relax. Each day you'll find that you can hold this position for just a bit longer.
3. After a couple of weeks, move up to 10-lb potato sacks, then try 50-lb potato sacks and then eventually a 100-lb potato sack in each hand, and hold your arms straight for more than a full minute.
4. When you feel confident at that level, start putting a potato or two in each of the sacks.