Volunteer work is tiring, but everyone finds it rewarding.
Tips
history
From 《论语·述而》: 饭疏食饮水,曲肱而枕之,乐亦在其中矣 — 'coarse food and plain water, a bent arm for a pillow: joy is there too.' Confucius's famous statement on finding contentment in simplicity.
usage
Typical sentence shape: [activity/hardship description], (但/却) 乐在其中. Emphasizes the gap between outward difficulty and inner enjoyment.