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Warm up and cool down?

If I’m doing strength exercises/lifting, do I have to do a warm up and cool down? If so how long etc?

Body-weight workouts

Can you find a study that supports (or does not support) that you can build muscle with body weight workouts?

Joint Strength

I’ve noticed pain in my knees when doing leg curls and wrist pain when doing dumbbell curls. I end up using lighter weights or skipping these exercises altogether. Is there a way to strengthen these joints or should I just stop doing these exercises?

Lifting 2 days a week?

I’m planning on working on strength and balance over the next few months, but realistically 2 days a week at the gym is probably all I can fit into my schedule. Will this be enough to build muscle? I’m pretty much a newbie, I’ve only lifted sporadically

How long should workouts be?

After juggling work and family time, I only have about 30 minutes to workout, is that long enough to be effective if I'm trying to lose weight?