Training intervals

What's the best way to build endurance for 200 stroke events or mid to distance free? some people at my pool tell me to do tons of repeats with only 5 sec rest if 25s, and only 10 sec rest if 50s or 100s. this doesn't work for me if I'm doing stroke or IM. My form breaks down after not that many repeats and I have to add more and more effort only to get slower and slower. ( and get less and less rest - double whammy!) i know some people will do 20-40 repeats of 25 at race pace to develop a 200 but what should be the work to rest ratio? i also know there is a science behind all this. Different intervals to train creatine phosphate energy system (ultra short) anaerobic energy system, and aerobic. Sometimes I think it might be better to give myself longer rest, like 20 sec on a 50 stroke so that I have time to clear lactate and each 50 is cleaner. But how do I train my body to clear lactate more quickly so I can actually complete a 200 stroke with quality. People say do lactate threshold sets, but again I don't know what that really means for me in terms of work to rest ratio, and what intensity of effort in the work part? i just did a 200 fly as 3.46 even though I was able to pull off a total swim time of 3.28 as a broken swim in practice coming in under 52 per 50 @ 1:00. I didn't think that was much rest to make that much difference but apparently 8 seconds is too much to be realistic i think i am I am beating myself up thinking I have to workout more and more to gain endurance but maybe I am just overtraining because I'm not making the improvements I'd like to see for how often I practice. any suggestions for me? thanks in advance!
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  • The standard USRPT set for 200s and up is 50s with 20 sec rest. Your goal time is 1/4 of your 200 goal time. If you miss the goal time you skip the next send off. If you miss it twice in a row, or three times total, the set is finished. I also like to do 100s with the goal time of the second 100 split of the 200. I give myself a lot of rest for those, enough to make the time, maybe 2x the swim time. I do USRPT, too, and, for the 200 free, have gone to using for a 50 target time. The difference is only about 1/2 second, but that makes a huge difference the ability to complete a meaningful number of repetitions before failing out of the set. I would certainly recommend a similar strategy for the 200 fly. The first 50 in that race can really throw off the target time if you use the (200 time/4) method. Unless your goal time is pretty close to your current time, it's probably too much of a stretch to train USRPT as your basis for target times. Not likely to get many successful reps. You gotta start where you are now, and work down.
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  • The standard USRPT set for 200s and up is 50s with 20 sec rest. Your goal time is 1/4 of your 200 goal time. If you miss the goal time you skip the next send off. If you miss it twice in a row, or three times total, the set is finished. I also like to do 100s with the goal time of the second 100 split of the 200. I give myself a lot of rest for those, enough to make the time, maybe 2x the swim time. I do USRPT, too, and, for the 200 free, have gone to using for a 50 target time. The difference is only about 1/2 second, but that makes a huge difference the ability to complete a meaningful number of repetitions before failing out of the set. I would certainly recommend a similar strategy for the 200 fly. The first 50 in that race can really throw off the target time if you use the (200 time/4) method. Unless your goal time is pretty close to your current time, it's probably too much of a stretch to train USRPT as your basis for target times. Not likely to get many successful reps. You gotta start where you are now, and work down.
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