@pschulz, I concur w/ @mrlavalamp. If your swim is <2k yds (or m) (give or take), then a kick set of 10% may be taking you away from other more substantial (“less marginal”) gains. Kick as part of warm-up (200 swim, 200 kick, 200 pull) isn’t bad, but it takes a (comparatively) long time to knock out a straight 200 kick (and for a 2k total workout, it’s still 10%). Now, kick sprints (say 25s or 50s) are something else and potentially useful for raising the HR to prep for the workout and, with regard to tri, helpful to train for quick acceleration out of or into a pack, to catch or avoid a wave for ocean swims/starts/finishes, to get out of the water, etc. But, if you want to get the body moving for the workout, better than a kick set is something like 2 x (50 slow/fast, 50 fast/slow, 50 easy, 50 fast).
And… are you doing kick sets with a board? If you’re not a great swimmer and you’re taking the time to kick because you need the strength, part of learning body position, etc, then using a board is a bit, though not entirely, counter-productive. The kickboard is a great platform for socializing (and working your left arm as you grab the oncoming person’s left and you give each other a giant pull), but it’s placing you in a bad position. (In other words, if you developing skill, don’t use a board. On your stomach and use your outstretched superman position to quickly scull to raise you head up to breath and sight, or be on your side alternating either half-way down or after the wall.) If you’re doing 4-5k workouts, then the kick set, even on a board, can have a place for resting your upper body muscles and building lower body strength.
And… are you only doing freestyle kick (ie on your stomach with or without a board)? Fly, back, breast kick help build muscles and endurance. Doing egg beater with hands up, ideally with elbows out of the water, will really help with leg strength and endurance. But is this the best use of your time if you’re swimming 2-2.5k? I don’t think so. I would suggest mix in some backstroke, which is complementary to free (and not breast or fly), before doing more than say 4x (or 6x) 50 hard kicks. (But if you’re doing back and are a beginner swimmer, then you have more technique issues plus navigation challenges!)
Personally, I’m not a TI fan, but that’s just me. Finding a good Masters program with a coach that will help you with technique is ideal. If you really need help, then I suggest finding a technique coach (perhaps your masters coach outside of the workout or at the side of the workout).
And on flip turns… as a swimmer for, er, holy moly, over four decades, please learn to do a flip turn and where to do a flip turn in you’re swimming with others. It just makes both your swim experience and that of those around you better and you’ll get more out of the workout. If you want more reasons: the efficient push off will help with explosive length strength, the proper form of not looking up helps with your body alignment, the act of not getting a breath at the wall helps with your breath control (ideally you’re not breathing your first stroke off the wall too), and the dolphin kick as you come off the wall to start your freestyle can recruit other muscles.
Just some thoughts. Remember they’re worth no more than double than what you paid me.
M