This is true. you must consider this!
<span>1. Muscular Strength
</span><span>2. Muscular Endurance
</span><span>3. Cardiovascular Endurance
</span><span>4. Flexibility
</span><span>5. Body Fat Composition
</span>
For more:
https://www.hkpl.gov.hk/en/extension-activities/misc/bugs/eng/bug/hpf_02.html
Usually these painting are made on birch trees because the bark has a much smoother surface compared to bark such as an oak tree.
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