Advanced: A set of 5- to 8-pounds dumbbells
Make it count: This workout uses high reps, 25 versus the standard 10 to 12, and lighter weights. By the time you reach the 18th or 19th rep, you should feel a burning sensation in your muscles, making it difficult to complete the set. If you can lift past the 25th rep, your dumbbells are too light. Increase by 2 pounds until you find a weight that challenges you to complete all 25 reps.