自分の体を50cm持ち上げるのがつらかったです(笑)
子供の頃は腕の力だけでロープを登っていけたんですけどねえ(^^;)

It was tough just hoisting my body up 50 cm. :-) When I was a kid, though, I could climb up a rope with just my arm strength. (^^;)