Rob,
I use the Stick like crazy...I usually stick the targeted muscle and then stretch it.If yuo have to Stick a forearm, you may have to "anchor" thew Stick on something and apply pressure as your "roll" it on your muscle. It should be detailed in the video.
As for your chins, do you wrap yuor thumb around the bar? I don't wrap my thumbs and my chins reps have gone up. Usually, my biceps will fatigue before my back does during chin/pulls.
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