Dr. Jim Suppan introduces the concept of time under tension for muscle growth.

• Defines time under tension as the amount of time a muscle is under strain during a set.
• Recommends a time under tension of 40-60 seconds for optimal muscle growth.

Dr. Suppan demonstrates time under tension with dumbbell curls, adjusting weight and pace.

• Shows that lifting 40 pounds for 8 reps at a normal pace does not achieve ideal time under tension.
• Lowers weight to 30 pounds and slows down the rep pace to extend time under tension beyond 40 seconds.
• Notes that the initial reps feel easy but the muscle strain intensifies as the set continues.

Explains the benefits of a slower rep pace for time under tension.

• Emphasizes controlled negatives and a slower pace for increased difficulty and effectiveness.
• Affirms that the longer time under tension with lighter weights can be more beneficial for muscle growth.

Dr. Suppan concludes the demonstration and directs viewers to further resources.

• Encourages viewers to refer to the provided table for detailed rep ranges and time under tension guidance.
• Directs viewers to bodybuilding.com for more information on time under tension and building muscle.