I have been a proponent of incorporating the battle rope with weights as a part of increasing muscle endurance and cardio. I have seen the inertia wave but I couldn't get my head wrapped around using a rope alternative that weighed 3 pounds. How is that going to give me a HIIT workout? Well, I purchased the Inertia Wave Solo. Shipping was fast and I was excited to get it. I put it to the test, using it for HIIT and cardio acceleration. I could not believe what I was feeling. The Wave blew my ropes out of the water. The HIIT was intense, and the cardio acceleration jacked my heart rate between sets. I just took intensity to another level! What just happened! I tested it on my clients, and they don't want to use anything else except the Inertia Wave! Everybody needs this tool. Time to purchase the Duo and the Strong.