my exercise plan

You're definitely going to need rest days, you'll hurt yourself if you don't give your muscles any time to repair themselves!

M: 30 day shred. 45-60minutes cardio. 30 minutes full body weights.
T: 30 day shred. 45-60 minutes cardio
W: 30 day shred, 45-60 minutes cardio
T: 45-60 minutes cardio. 30 minutes full body weights.
F: Pilates
S: 30 day shred. 30 minutes full body weights.
S: 30 day shred. 45-60 minutes cardio.

Do you think this is a good plan? Is it too much?
Do you think it is better to do 3 whole body days or 3 days for separate muscle groups? (Biceps/chest, shoulders/back, legs/abs)
Also, do you think it's better to do no cardio (other than 30 day shred and warmup) on weights days?

What was your workout plan before this? If you weren't doing much activity before, I would work up to this amount to avoid the risk of injury or burnout.

I like following a P90X type philosophy: alternate weight days with cardio days and focus on one group of muscles at a time. Eg: this week I did Legs & Back, Shoulders & Arms, Chest & Back (each an hour long workout and never two consecutive days). The other four days I do yoga or swim or bike or run.

Also, I've been really interested in the 5 dimensions of fitness: Body composition (fat vs. lean-->this is mostly where the nutrition part comes in), cardiovascular endurance, muscle endurance (low weights high reps), muscle strength (high weights low reps), and flexibility. For your 45-60 minutes cardio…if you consider high intensity interval training (HIIT), it may shorten your workout time with the same benefit.

M: 30 day shred. 45-60minutes cardio. 30 minutes full body weights.
T: 30 day shred. 45-60 minutes cardio
W: 30 day shred, 45-60 minutes cardio
T: 45-60 minutes cardio. 30 minutes full body weights.
F: Pilates
S: 30 day shred. 30 minutes full body weights.
S: 30 day shred. 45-60 minutes cardio.

Do you think this is a good plan? Is it too much?
Do you think it is better to do 3 whole body days or 3 days for separate muscle groups? (Biceps/chest, shoulders/back, legs/abs)
Also, do you think it's better to do no cardio (other than 30 day shred and warmup) on weights days?

Too much cardio. Create a deficit through your diet, not cardio.

I recently read that your body builds muscle on the rest days... I wish I'd saved the link.

I have a very fit friend who is about 10 older than I am and he's always done 2 days on, 1 day off...

bump for math example to follow.

Every time you push your muscles with strength training you do damage to the muscles. It is important to rest so that they can rebuild, get stronger, so that you can damage them again. When you do too much strength training you cause damage on top of damage and it catches up with you. 3 days of strength training a week is ideal, 2 is okay and 1 is not enough. Any more than 3 is too much.

As for cardio, as your course has you doing so much of it I don't think it's very beneficial to be doing so much INTENSE cardio on your own time. Pilates/walks/swimming is low-impact so you aren't pushing yourself very hard. You need to let your body rest & at least one day a week completely rest, perhaps designate a study day to catch up on theory work or something?

Okay so how about :

M: 30 day shred + legs and back
T: 30 day shred + 30 minutes HIIT training
W: 30 day shred + 30 minutes HIIT training
T: shoulders + arms
F: Pilates
S: 30 day shred + chest and back
S: 30 day shred + 30 minutes HIIT training

So what happens to glucose stores on intense work outs and calorie deficit diets?
And how does that effect your body's source of fuel?
When glucose runs out, muscle is only thing that can be broken down to supply it.
What is in the muscle stores can NOT be put into the bloodstream to keep blood sugar levels where the body wants them as fuel for brain. And muscles stores are secondary to what is in the liver.
Upon refill, liver is first, muscle is second if any left over. If all that is full, then to fat.

Eating 1700, doesn't appear to eat back exercise calories usually, so that simplifies the math, and decent 200 cal worth of carbs it appears on avg.

Starting on Saturday after this supposed "rest day" of pilates, we'll pretend your glucose stores got filled up because of no cardio, so liver 400 cal and muscle 1500 cal worth of glucose storage.

Carb % expenditure on exercise and replacement by food. Effects from multiple day intense workouts.
Assumptions based on fact energy is supplied by fat and carbs, with ratio going to carbs as you move from rest to anaerobic state.
30DS is intense and 70% carbs.
HIIT is 100% carbs briefly down to 60% carbs during recovery. Calling it 70% too.
Weights is 100% carbs during lifts, recovery time less. Calling it 60% and that is generous.
Not including ANY other daily activity, which of course even the BMR takes 30% carbs while sleeping, all other light activity is between 40-50% carb usage.

Sat:
500 @ 70% = 350
250 @ 60% = 150
Eat 200.

Liver 400 - 350 = 50 (Liver would have dropped low enough during anytime to kick in muscle breakdown. And eaten carbs wouldn't have even topped the liver off.) + 200 = 250
Muscle 1500-150= 1350

Sun:
500 @ 70% = 350
300 @ 70% = 210
Eat 200.

Liver 250 - 350 (Liver empty again, muscle breakdown for whatever the body needs until next eating) + 200 = 200
Muscle 1350 - 100 (liver couldn't supply) - 210 = 1040

Mon:
500 @ 70% = 350
250 @ 60% = 150
Eat 200.

Liver 200 - 350 (this again) + 200 = 200
Muscle 1040 - 150 (this again) - 150 = 740

Tue:
500 @ 70% = 350
300 @ 70% = 210
Eat 200.

Liver 200 - 350 (again) + 200 = 200
Muscle 740 - 150 (again) - 210 = 380

Wed:
500 @ 70% = 350
300 @ 70% = 210
Eat 200.

Liver 200 - 350 (again) + 200 = 200
Muscle 380 - 150 (again) - 210 = 20

Thu:
250 @ 60% = 150

Liver 200 - 150 + 200 = 250
Muscle 20

Fri:
Pilates "non-workout"

Here's what is interesting with this math - this is actually generous on the safety side of the worse not happening.
On each of those days, you have good 150 carbs used just by the brain.
Plus all the other activity.

Result on most of those days, the already depleted liver stores can't keep the blood sugar up during or after the workout. Muscle must be broken down to supply that.
During this whole glucose depletion, you will lose glucose and water weight. 1500 cal of glucose weighs 3 lbs.
The muscle broken down only needs to provide 600 cal in a week for 1 lb to be lost through that.
Oh, it won't be the muscle you are working out (which has no fuel to grow it either), but other muscle.

Just suggesting by this math - eat back your exercise calories, and with that intense, you need 2 rest days.