Weight training/fat loss

I think this can go in both forums...so that's why I'm posting it twice.

I'm trying to decide what reps and sets I can use for fat loss. I read that 6-10 is muscle building and 10-15 is toning, but how come a lot of ppl do 15-20 reps for toning? I've been reading about nutrition and weight lifting for the past 8 yrs, so I know a lot about it, but I'm confused at this part. My schedule so far (limited bc of a bowflex, bad tricep and bad back):

chest flys- 3 sets of 12-14
dumbbell shoulder press- same
dumbbell curls- same
then I do wall sits for 1 min each, 3 sets with 30 secs rest. The rest btwn the weights are 45 secs. I do this 3 days a week, 1 day of rest btwn and 2 on the weekend.

When I go back to school tomm, I'll have better facilities, so I'll be doin more like:

Seated dumbell rows, barbell curl, shrugs, barbell press, bench press, hack squat or leg press. Sometimes I can do triceps pushdowns but my right tricep clicks when I do overhead triceps extensions and my lower back is so bad, I can't even do 5 partial hyperextensions without it killing me.

For all of these weights, I'll be doing either 3 sets of 12-14 reps or 3-4 sets of 15-20 with a BIT lesser weight....but not sure about the reps. Basically, I'm looking for definition and fat burning, not muscle building. I could do 3-4 sets of 8-12 reps, but that still includes some muscle building.....I want to lose weight, not gain muscle (adds weight). No muscle, just fat loss and definition...got it? Good! lol....thanks all.
 
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