A little fitness humor about how to make progress with your lifting:
1. Stand on a firm surface, where you have plenty of room on each side.
2. Take a 5-lb potato sack in each hand. Extend your arms straight out from your sides. Hold your arms out as long as you can, then relax.
Each day you'll find that you can hold this position for just a bit longer. Build up to one minute.
3. After a couple of weeks, move up to 10-lb potato sacks. Then try 50-lb potato sacks and then eventually progress to lifting a 100-lb potato sack in each hand, while holding your arms straight out for a full minute.
4. When you can do this successfully, progress by putting a potato in each of the sacks.
Personal Trainer, Fitness Instructor since 1998.