Your trusses are probably 2 x 4, so I guess what I'm getting at is I'm not sure how well a single 2 x4 is going to support your 100lb punching bag, especially since you'd need a big ass lag-type hook to hang it properly. What I'm thinking is some doubled up 2x6 or 2x8 ran across two trusses. This would handle the weight much more appropriately.
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