Hello guys. I've just came back to the Double Bass after taking 7.5 months off. I've went back to the same teacher I was working with before, just to make sure my technique is still in check. I've been back at the bass for a week and 2 days now (got myself one of the Thompson plywoods); I've been enjoying the hell out of it, but my right forearm is getting really sore midway through my pizz exercises (I stop immediately, and stretch for a minute or so). I don't know what's wrong, and my technique is exactly the same as I had it before and never experienced this problem on the bass I used in high school. My practice routine is a lot harsher than it was before (It used to be 2 hours every other day, and a 3 hour rehearsal one a week), and here's what it is. 6 Hours divided into four 90 minute sections : 1. Scales with the bow/Zimmerman's contemporary Concept of Bowing. 2. Etudes/method book/solo repertoire. 3. Scales pizz (not all 48 majors/minors, just the majors 2 octaves as a warmup)/Zimmerman contemporary concept of bowing but pizz. 4. Work on heads to various bebop tunes (finally got Scrapple and Ornithology back up to speed) I'm sure there are a lot of variables at play, and I'm sure how my bass is setup is one of them. The action is more of a medium action and the strings I'm using are Spiro Mittel EA, and Evah Pirazzi Weich DG. The bass I used in high school had a fairly low-medium action, and the strings were some really cheap brand that was on the bass (they had a really low tension to them). The pain I'm experiencing is not sharp, it's just a feeling of soreness and tightness in my forearm (almost like a cramp). So my main question is : Am I jumping into this and practicing too much with a bass setup/string setup I haven't come accustomed to before, or am I doing something else wrong? Thank you in advance for any replies.