1: Doing yoga is good for your health.
⇒ It's good for your health to do yoga.
2: It's important to do physical exercise regularly.
⇒ Doing exercise regularly is important.
3: Why don't you take up doing sport?
⇒ How about take up to do sport?
4: The best time for doing yoga is in the morning.
⇒ You should do yoga in the morning.
5: It's not necessary to do many outdoor activities.
⇒ You don't have to do many outdoor activities.