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I think a hill would serve you best, either running or cycling. The point is too 'blow your lungs out' so to speak and to get your heart rate as high as possible.Thanks man.
I have started doing regular 5kms, managing a rough time at the minute of 25 minutes.
Regarding high intensity work , I see some people doing this all year round- like crazy burpees squat workouts etc .Surely this cannot be good for the body all year around?
I get your point regarding a few times a week, I'm a bit of a noob when it come to conditioning and understand that this type of workout is a high stresser.
So correct me if wrong, sprint as fast as I can for as long as I can then rest?
Yeah I do blow out in competitions, sometimes it is a physical thing but last time it was so bad mentally I just couldnt think either.
Regarding cycling , I struggle to get a good "lung" type of workout with this, I just find its more tiring from a muscular standpoint - I'm doing it wrong surely.
It's difficult but not impossible to do this in a sport like grappling where you have a partner. It can be achieved, but it's harder to control and sustain that level of intensity when dealing with another person.
If you're not experienced at cycling, then it will be easier to achieve this running, but I can explain why you're having a hard time reaching that level of cardio intensity. The reason you're getting muscle fatigue before you max your heart rate probably has to do with your gearing. You might be in too tall of a gear, that is your cadence is too low (you turn the pedals too slowly). Riding a big gear like this will use the legs in your muscles more, but will be less taxing on your cardiovascular system. When you ride in a low gear where you spin the pedals faster, especially going uphill, you place more stress on your heart and less fatigue on your legs musclular endurance. For the purposes of this type of high intensity cardio training, this is what you want.
Again, running or riding uphill will make it easier to achieve this.
I think you'll have a better quality workout if you sprint for a set length of time like 30 seconds, recover 5-10 minutes by walking (don't just stand or sit, you'll clear the lactic acid in your muscles faster by staying mobile and keeping the blood flowing), sprint 1 minute, recover, sprint 90 seconds, recover, etc. The reason being that you're going to 'blow up' or 'hit the wall' after a short time of sprinting and then your output and the quality of your effort will be greatly diminished. If you truly go all out, after 5 minutes your pace and performance is going to drop too much to really be a great effective workout after a few minutes. You'll force yourself to slow down to recover and it's better to end the interval at that point to recover and prepare for the next one at that point then to keep pushing.
Think of it like doing weight lifting in sets. The purpose of resting between sets is to ensure that you're recovered enough to continue to do more quality sets. Once you're too fatigued to do more quality sets, you don't need to beat a dead horse. You've done enough to wind down your work out and do a cool down.
This is why I prefer to do the shortest intervals in the beginning of the workout after I complete the warm up, when I have the most energy for the intensity I want in a 30 second effort which will be greater than the intensity I use in a 5 minute effort. It makes more sense to do the more intense effort first while you have more energy.
Again, big long hills make all of this easier. You don't want to run out of road during an effort before you hit the wall. After you notice the quality and intensity of your intervals going down you can cool down, which is ending your workout with a light effort to clear the waste product and lactic acid built up in your muscles. You might feel exhausted like you just want to sit or lay down after a hard interval or training session, but the cool down is important. Stretching is best done immediately following the cooldown when the muscle is still warm.
Hope this makes sense.