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![Dr_Biohacker Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1938600573911420929.png) Dr. Biohacker [@Dr_Biohacker](/creator/twitter/Dr_Biohacker) on x 7555 followers
Created: 2025-07-18 12:19:50 UTC

Try zone X cardio:

• Heart rate: 60–70% of your max
• Duration: 45–60 minutes
• Frequency: 4–6 times/week

At lower heart rates, your body uses fat for fuel.
Go too hard, and it switches to carbs.

![](https://pbs.twimg.com/amplify_video_thumb/1946183017506144257/img/qEd2Yr3_w6OhrjFk.jpg)

XXXXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1946183125761245679/c:line.svg)

**Related Topics**
[rates](/topic/rates)

[Post Link](https://x.com/Dr_Biohacker/status/1946183125761245679)