For reference, I shovel dirt, split wood and cut branches. My upper chest isn’t super developed either.

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At work I used a handheld leaf blower. I’d alternate hands and lift it up so my biceps were resisting.

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i kind bench, db bench, or incline cables for upper chest and biceps i like to do curls that go half half full 5 reps for all or til fail on full. i also started adding cable curls but idk the name for them. youtube could also help with this.

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