For as long as we’ve been doing LM (about a year now, as we were moving, new baby arrived and my LO had periods when she didn’t want to do music lessons at all) she likes most parts of it, but completely doesn’t get the clap-along part. As soon as it starts - she’s start dancing or clap or stomp her feet completely out of rythm. I tried to explain to her that you only clap/stomp when the character on the screen does, or when a shape crosses the line, tried counting, tried changing the rythm settings - nothing works, she just claps whenever she fancies, mostly too fast. Any tips please?
Thank you
Have you tried clapping or tapping during playtime while chanting, counting or singing nursery rhymes? You can find fun ways to engage her in following the rhythm like action games, using household items for tapping, a favorite stuffed animal to make it clap, etc. You can join her in stomping and jumping during clap-along, maybe she’ll like it 
This can be tricky for many kids. With my class of 3/4 year olds we all start clapping and I go around the room helping them get it in time by holding their hands and clapping them in time to the rhythm. After a few claps they can often but not always continue the pattern. We do this everyday and before the first few months they are all clapping in time. For some it Takes a lot of Practice.
You could try marching around the house left right left right left right…
thanks for the replies. Yes. I tried helping her by holding her hands while clapping, holding her foot while stomping - she would give up doing by herself or take her foot/hands away. Tried marching - she starts dancing completely out of rithm/tune. If we sing the rhymes - she starts dancing and stops clapping alltogether, and we always do it together, but she doesn’t take my lead 
Try jumping instead of clapping or even jumping with her in your arms, so she can “feel” the rhythm. But then just dont make a huge deal of it and continue doing it correctly yourself setting an example and having fun, she will get it eventually. Rhythm is actually quite tricky for little ones. I also would suggest doing it with a drum or smth you can use for banging, sometimes it is easier then clapping. Most of all just have fun and dont stress it too much.
My boy could never clap along, he later started learning the acoustic guitar and couldn’t really keep time with it either, but then when we got RockSmith he immediately could keep time while playing on his new electric guitar (once he got the hang of holding this bigger guitar that is) because he needs to be in time or else he misses the notes in the game. I started tapping to a beat while singing or listening to music when I was pregnant and I still tap his back now at age 3, I’ve done this countless times, multiple times a day, it’s just a habit and I’ve always thought it soothes my boy, but he really could never keep beet before he needed it to play his RockSmith game, so before that, he never could. Kids often look like they’ve not learned something, maybe they’re pretending, or maybe they believe it themselves, but that doesn’t mean they’ve not learned.