So my teacher lent me a very nice bow for the summer, but it weighs 146g and is quite stiff. I'm used to bows mainly at 133-135, though I have a Snakewood Walke bow at 142. Is there any way to approach playing on a heavy bow without injury? I've been using less arm/hand motion and have been concentrating on relaxing but I can't play for long periods of time with this bow without my hand becoming tense. When learning how to play with a heavier bow do any of you do "strength" training exercises for your hands? Thanks...I'm just worried that I might injure myself using a heavier bow even though the bow has more volume and tone.