My kids have missed being regularly bored and learning to deal with it. I am not joking, I believe boredom (and the independent, creative action boredom spurs) are very important. Lack of boredom also means they rely less on their siblings for companionship, which I am genuinely sorry about. Of course, they also fight a lot less than my siblings and I did. But fighting and learning to live with/rely on others is also an important life lesson.
I also believe true downtime- time for nothing but daydreaming- is important. it And my kids get much less of that due to daily sports practice (not just gymnastics) - plus school.
Of course these days with so much screen media, lots of kids are missing out on the benefits of experiencing boredom and true downtime. But our family has little media and what we have we restrict, so in our case it is the sports plus school that takes the time from these things.
Chore ideas:
My kids have "big" weekly chore jobs (so, they do them on the weekend, usually.) These are dusting and vacuuming whole house (one kid) and cleaning our 2 bathrooms (other kid). My 7 year old usually loves to help with whatever and keeps her room neat without prompting, so at this point she does not have weekly chores. Daily expectations for all are quick and easy things like setting/clearing table, packing/unpacking their own lunch, rinsing stuff and putting it in the dishwasher, light dishwashing as needed. But the way their practices are, even my gymnast son only has one day of the week where he is not home at least a short time between school and gym. If they were gone all day early am to bedtime, I would not make them do daily chores. While they COULD get up early or stay up late to do things, maximising sleep time is in my opinion more important.