Herbert,
Sorry to hear that you are lacking motivation to swim. Motivation is a funny thing. Nobody can give you or take your motivation. That’s right, it’s how YOU perceive various stimuli that cause you to feel motivated or feel lack thereof. One person might perceive hardass comments of a coach as motivational, whereas another athlete might perceive them as complete the opposite.
Whenever I’m not motivated I try to analyze which factors I perceive as negative motivational. Then I try to replace them with another stimuli which I perceive as positive. Sometimes it’s simple things that can change my motivational state. Buying new equipment, changing the workout environment, replacing the workout stimuli, etc. have helped in the past for me.
For swimming, I might change the pool. It’s amazing what that can do - at least for me Not all tiles at the bottom of the pools are the same. Not all lifeguards listen to the same radio station that I can hear during the rest periods in between sets. It might sounds silly but find whatever works for you.
If you are not swimming with a masters team, join one, even for a couple of the sessions per week. If you already are swimming with a masters team, maybe you would enjoy your own session every once in a while.
Swimming can be monotonous and boring. Believe me, I’ve swam my 100km weeks before. But it doesn’t have to. Many triathletes believe that 3000yrds nonstop swim is better than various sets. I call that BS. Look at many Long Distance (open water) swimmers. Most of them train in a pool with a team that swims many interesting sets. Switch it up a bit. Just because a pool consists of 25 yards/meter lanes doesn’t mean you have to do 100s,200s, 400s, etc. at all times.
4x25, 3x50, 2x75, 1x100, 2x75, 3x50, 4x25 and you already have 900yrds. Add various strokes, intensities, and rest period to that and it can become quiet interesting.
Or how about a long warmup consisting of:
400Free,50Back, 300Fr, 50Bk, 200Fr, 50Bk, 100Fr, 50Bk, 200Free, 50Back, 300Fr, 50Bk, 400Fr and you already have 2200yrds.
IM doesn’t always have to be the same, either. 250IM (25Fly,50Bk,75Br, 100Fr) or other combos work as well.
Hopefully that helps a little. Signing up for a tri, even a sprint might not be a bad idea, either. Once you commited to something, you might feel different about it.
Now get to the pool and report back.
Good luck!