Mac explains this week's challenge: Max Power Test Win Keiser gear! How to Perform the Challenge: Determine your Keiser Optimal Power Resistance (KOPR) for bench press or another exercise. After a good warm-up, perform 3-5 explosive reps at 50% of your KOPR at/or above 90%. If you fall below 90%, end the test. Record your highest wattage, as that will be your Speed Baseline. Watch the video for further clarification and to see a demonstration. How to Enter the Contest: 1. Watch the video. Follow