I think 1 min intervals of jumping rope is a great workout. In most of the HIIT workouts, the high intensity part is only maintained for a minute or so (and jumping rope is way high intensity). Concentrating on trying to reduce your rest periods in between intervals would be a good goal.
You need to give it a lot more time than three weeks. Swimming is the only exercise I've ever done where I saw noticeable improvement in a short period. With everything else I've done (running, stepmill, elliptical, plyometrics, strength training, spinning), it's taken a lot longer to notice any improvement--months, not weeks.
But if you keep at it, you will absolutely improve. It creeps up on you. You don't feel like you've increased your endurance at all but one day you are walking with friends and you realize they can't keep up with you.
Giving yourself a goal like shaving 5 or 10 seconds off your rest intervals every week will help. You might not feel like you are improving, but the next thing you know, your rest intervals will be quite a bit shorter. So even if you don't feel like you've improved, you'll know you have.
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