My dc are now adults, and out of the four of them one did music to Grade 8+ county orchestra level, and two did sport to a high standard, one to GB level. Along this road I have encountered many many pushy parents, so I have some views on what is and isn't reasonable in terms of supporting your dc, and how those things are likely to pan out in the future.
Things that are reasonable:
-Insisting a child does some kind of physical activity once a week;
-Insisting that a child who has chosen an activity sees out the term that you have signed them up to/have paid for when they try and sack off on the first wet Thursday evening in November;
Insisting that a child who wants to be a member of a sports team turns up to the scheduled practice sessions;
-Insisting that a child who has chosen to have music lessons does the required amount of practice every day.
You will note that these things are not about attaining high levels in the chosen activity, they are mainly about teaching the child commitment, responsibility and perserverance, as well as learning to take pleasure in mastery of a skill and how to work with others.
Things that are not reasonable and should cause you to give your head a wobble:
-Expecting your child to be good at the activity they have chosen, particularly if you find yourself bothered that other dc are better/faster/more skilled than them;
-Expecting your child to be motivated to do an activity that you have chosen for them, particularly if either parent has done this activity in the past/wishes they had done this activity/is actively involved in the sport/activity themselves. Parents coaching their own child in a group setting is a particularly problematic scenario IME.
-Pushing your primary-age child to do more than one session of a particular sport per week, unless this is something that they are very highly motivated to do themselves.
-Pushing/guilt-tripping the child into continuining an activity which they are clearly ambivalent about. If it seems like they're not enjoying something, conversations need to be had about trying to find something that might appeal to them more.
What you are doing is pretty much all four of the unreasonable items, and it will not end well. The child may comply if there is a lot of parental pressure and/or that is their personality, but it will come back to bite you, either via increased levels of family conflict, or you end up putting the child off any kind of sport. You're also missing an opportunity to support your child to find an activity that they enjoy and which they can continue through their teenage years - positive involvement in structured sport or music is brilliant for teenagers as it takes them away from all the far less wholesome things they could be doing with their time and provides them with a similarly-minded peer group. The participation is the key here, not the actual level of achievement.
The path you are taking is likely to achieve the precise opposite of that kind of good outcome. You and your dh need to take a long hard look at yourselves, have a proper rethink and TALK TO YOUR CHILD about what he actually wants and how you can support him to do that.