I'm able to do sports to the extent that I can enjoy doing it.
ご質問ありがとうございます。
"I'm able to do sports"=「私はスポーツが出来ます」
"to the extent that I can enjoy doing it."=「楽しめる程度まで。」
追加:「運動は得意じゃないけど、このスポーツはずっとやって来たから...」→ "I'm not particularly good at sports, but since I've done this sport for a long time now..."
ご参考に。