The jump rope is arguably the most underrated fitness tool in existence. At $20-40, it's cheaper than a month's gym membership, fits in a backpack, and can be used anywhere from your living room to a hotel car park. Most importantly, jumping rope burns more calories per minute than running, rowing, or cycling at similar perceived effort levels.
For HIIT, the jump rope is ideal because intensity can be instantly modulated. Basic two-foot jumps are moderate intensity. Single-leg jumps, double-unders (the rope passes twice per jump), and triple jumps are brutally intense. A simple HIIT protocol: 40 seconds of double-unders or maximum single-foot jumping, 20 seconds rest, for 10-12 rounds. This 10-12 minute session burns as many calories as 30 minutes of moderate jogging.
Beginners should start with basic two-foot jumps and focus on consistency before speed. The most common errors are jumping too high (you only need to clear the rope by a few centimetres), looking down at your feet, and using your arms instead of your wrists to turn the rope. Start with 5-10 minutes of continuous jumping as a warm-up or finisher, then gradually build to dedicated HIIT sessions. Invest in a quality speed rope - cheap ropes tangle constantly and will kill your motivation.