Dictionary / Vocabulary / 強いて言えば
しいていえば
if I had to say; if pressed (to answer); if I must choose; if I had to choose
Also written しいて言えば、強いていえば
これと言って趣味はないんですが、強いて言えば、音楽鑑賞ですかね。
I don't know if you'd call it a hobby, but to stretch it a little, you could say music appreciation is my hobby.