Muscular strength, benefiting our muscles, joints, ligaments and bones, can be improved by...

1. lifting weights - barbells, dumbbells, kettlebells.
2. body weight exercises like push- ups, pull-ups, hand stands.
3. chores like lifting heavy objects (heavy feed bags or bags of soil for a garden).

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5 points
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All of the above

Yes, all of the above activities can help improve muscular strength.