If you’re practicing jumps as a “cardio” exercise, you’re missing out on the power and precision you can gain from training them as a skill. Learn how to improve your jumps and about the immense benefits to be gained.
Using front and back scale gymnastic positions can help you build the physical skills you want. See how mastering these skills can improve strength, flexibility, & balance.
You want a strong core – who doesn’t? But the typical crunches and sit-ups you’re used to aren’t the way to go. There’s a much better way, and you’ll probably enjoy it a whole lot more than endless crunches.