USPRT Workouts?

Well if you're aiming for a 15k swim, you need to get used to boring. Going those distances is as much about the mental as it is the physical part of it. As I've said before, you need to get your body and mind trained for those hours in the pool to prep you for OW. You need to do the work in the pool to get consistency and pacing down in order to be successful in OW. Go dig into training that the competitive OW swimmers are doing and I guarantee there are a lot who train mostly in the pool. If you can't hang, you need to just go back to orienteering. And to continue the insight that many of the others have given, I started swimming Master's about 6 years ago. Entered my first OW race a year later just to see what i could do. Each race, I learned something new to make the next one better and more efficient. I've had several coaches and each one has given a different perspective and that's training with them 3-5x per week all year around. I work on my stroke ALL THE TIME; constantly checking in on form, technique and efficiency. And it's 6 years of gradual improvements for me to finish competitively in many of the races I'm in. As others have said, swimming has a ton of nuance and you have to make tweaks over time. If you're unwilling to put in the time or listen to what people have been telling you for three pages of forum, then I just don't know what to tell you. Maybe Orienteering is your sport. The weeks after I have signed up for the 5 km seems already forever to me. I am very bored in my life and no one seems to understand my frustration. I just don't want to do another boring sport. Doing marathon running in my city is not boring and all my friends do it, but whenever I run 10+ km my feet get pain so I am trying to go for marathon swimming instead. However, none of my friends are doing it at all, and I can't join the very few who are doing it in my city because they are too fast for me to join. Also, the lack of races make my wait for a race seems forever, and the cut-offs seem scary for me. In the U.S. and Europe, there are many 2:00+ / 100 m pace swimmers doing marathon swimming, and there are many events which cater for those "recreational" swimmers. However, what I feel in my city is that everyone only f**king cares those fast swimmers under 1:50 / 100 m. The 5 km race has 1 hour and 45 minutes cut-off, the squads here requires under 2:10 / 100 m to join, beginner classes are not offered year-round (suspended in winter), the open water groups require 2:10 / 100 m to join, etc. I don't know how many bad practice I have got in my previous 3 - 4 years in order to force myself to the level of 2:10 / 100 m without access to any squads / coaches. I didn't start off as a beginner, but instead accumulated 3 - 4 years of (mal)practice before I joined a team. I just want to catch up 3 - 4 years of lost progress without wasting any more years! and I'm setting goals as if those 3 - 4 years weren't wasted. I started open water swimming because I love the sea and love the freedom without a wall every 50 m, however those 3 years were very sad for me and I want to get over it ASAP. As I have already set my ambitious goal for next year, I will still try my best to train for it. If I make it I continue, if I don't I give up as there is no one willing to support me and no local races which I can make the cut-off if I can't get to 1:45 / 100 m level. I don't really want to waste another 3 years on top of the 3 - 4 years already wasted. P.S. I cannot swim for 2 days already because of thunderstorm, and typing this when it is lightning outside.

Well if you're aiming for a 15k swim, you need to get used to boring. Going those distances is as much about the mental as it is the physical part of it. As I've said before, you need to get your body and mind trained for those hours in the pool to prep you for OW. You need to do the work in the pool to get consistency and pacing down in order to be successful in OW. Go dig into training that the competitive OW swimmers are doing and I guarantee there are a lot who train mostly in the pool. If you can't hang, you need to just go back to orienteering. And to continue the insight that many of the others have given, I started swimming Master's about 6 years ago. Entered my first OW race a year later just to see what i could do. Each race, I learned something new to make the next one better and more efficient. I've had several coaches and each one has given a different perspective and that's training with them 3-5x per week all year around. I work on my stroke ALL THE TIME; constantly checking in on form, technique and efficiency. And it's 6 years of gradual improvements for me to finish competitively in many of the races I'm in. As others have said, swimming has a ton of nuance and you have to make tweaks over time. If you're unwilling to put in the time or listen to what people have been telling you for three pages of forum, then I just don't know what to tell you. Maybe Orienteering is your sport. The weeks after I have signed up for the 5 km seems already forever to me. I am very bored in my life and no one seems to understand my frustration. I just don't want to do another boring sport. Doing marathon running in my city is not boring and all my friends do it, but whenever I run 10+ km my feet get pain so I am trying to go for marathon swimming instead. However, none of my friends are doing it at all, and I can't join the very few who are doing it in my city because they are too fast for me to join. Also, the lack of races make my wait for a race seems forever, and the cut-offs seem scary for me. In the U.S. and Europe, there are many 2:00+ / 100 m pace swimmers doing marathon swimming, and there are many events which cater for those "recreational" swimmers. However, what I feel in my city is that everyone only f**king cares those fast swimmers under 1:50 / 100 m. The 5 km race has 1 hour and 45 minutes cut-off, the squads here requires under 2:10 / 100 m to join, beginner classes are not offered year-round (suspended in winter), the open water groups require 2:10 / 100 m to join, etc. I don't know how many bad practice I have got in my previous 3 - 4 years in order to force myself to the level of 2:10 / 100 m without access to any squads / coaches. I didn't start off as a beginner, but instead accumulated 3 - 4 years of (mal)practice before I joined a team. I just want to catch up 3 - 4 years of lost progress without wasting any more years! and I'm setting goals as if those 3 - 4 years weren't wasted. I started open water swimming because I love the sea and love the freedom without a wall every 50 m, however those 3 years were very sad for me and I want to get over it ASAP. As I have already set my ambitious goal for next year, I will still try my best to train for it. If I make it I continue, if I don't I give up as there is no one willing to support me and no local races which I can make the cut-off if I can't get to 1:45 / 100 m level. I don't really want to waste another 3 years on top of the 3 - 4 years already wasted. P.S. I cannot swim for 2 days already because of thunderstorm, and typing this when it is lightning outside.