Practice? Depends upon how much breath support for singing I need. Backgrounds, I will sit at practice. Leads, I'm up. At 68, I don't feel guilty to sit. And I stand at gigs. Except last year when I broke my foot.
I stand most of the day at work so I sit every chance I can. I also play DB so I only stand when playing that.
I have my strap adjusted so that my bass is in the same position sitting and standing. When sitting, my bass is naturally in "classical guitar" position, on my left thigh rather than my right. I find that this makes it easier to transition between sitting and standing, for me. I do tend to sit more when practicing individually at home. In rehearsals it's a mix: mostly standing, but I'll sit for a while if the rehearsal is long.
I stand at rehearsals, and sit at home. Sometimes I'll stand at home, but since I'm on my feet all day long at work I'd rather sit.
I really depends on the mood; halfway through a song I'll either get up and walk around aimlessly or sit down. Either way.
Practice I sit. Show time I stand until my hips tell me it's time to sit. I have a tall stool that I can back up to and take a load off.
I generally sit when I'm practicing. However, when I'm working on new songs where I'll be both playing and singing (lead or harmony/backup), I set up a mic on a stand and I play standing up at the mic so it's more "realistic". I'll do that until I can more or less go on autopilot, at which point it's back to the chair.
Sit all the time, because my main gigs are seated (big band, coffee house gigs). If I need to play standing up it's usually not the toughest of materials and I don't need to read off a chart.
^^^This^^^ I do a fair amount of lead vocals and harmonies on almost all the others, so until I learn 'em well...
Not comfortable ever sitting and playing. For myself it would be like playing baseball and sitting while at bat.
Stand when really practicing, sit while noodling. My strap is situated so that the bass hangs in the same spot standing as it does when sitting "classical style". I get very close to the same left and right hand and wrist angles whether sitting or standing. Like this guy, but without the footrest. {}
I'm 73 and I sit all the time. The rest of our band is about the same age and they sit too. No one has complained yet, but then we're not "cool young dudes (or dudettes)," either.
{} {} {} Like to practice standing up so I can move around, but will sit when I want to relax. Sir Paul practicing with both.
Practice the way you are going to play at the gig. If you stand at the gig, stand when you practice. I feel this is even more important if your bass sits on you differently from when you are standing or sitting.
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