Answer:

You can answer it po in your own opinion or experiences.

Here's the definition:

Recreational activity - Any outdoor activity conducted for the purpose of fitness, relaxation, or pleasure, including practice or training in any such activity.

Try considering these examples:

Cycling

Adventure of Sports (Hiking, Kayaking, Skiing etc.)

Walking

Fishing

Photography

Swimming

Gardening

Dancing

... more

After considering them - the examples - think of what specific Recreational activity tire you the most. Then simply answer why.

Here's how would I do it -

I have been living by the sea since I was 5 years old. Most of the people living here love to swim. So do I! I love swimming out of pleasure but it tires me the most. Whenever I swim, I become so hyper to extent that I get exhausted afterwards. Nevertheless, it's worth-it.

OR

Out of all recreational activities I do, hiking tire me utmost. Simply because I always love to give my best for it. It doesn't tire me for a bad reason. It tires me for pleasure! That's why the pain it gives is worth-it. I would rather tire myself by doing it.

Hope it helps.

It keeps lagging. Sorry bit late.