Trying to fit in cardio to my weight lifting routine

I'm having a tough time fitting cardio into my weight lifting routine. I know some guys say not to do cardio and it cuts into your weight training gains, but I have a minor heart thing and need to do at least SOME cardio during the week. Here's my current routine:

Sunday: Upper body (chest, back, shoulders & arms)
Monday: off
Tuesday: Upper body (chest, back, shoulders & arms)
Wednesday: Lower body (glutes, legs) and core
Thursday: Upper body (chest, back, shoulders & arms)
Friday : off
Saturday: Lower body (glutes, legs) and core

I was thinking of dropping one of the upper body days (probably Tues) and replace it with HIIT, but I'm not sure if I want to do that. My legs are usually sore for a day or so after lower body, so doing it after my regular routine on Thurs or Sun wouldn't work because my legs are too sore to sustain 25 minutes of HIIT.

Any suggestions?
 
How long have you been at this routine? Generally, your muscles stop getting so sore after each workout as they become more used to the exercise.

My suggestion is to either just throw in a 15-20 minute cardio session at the end of your workouts or to do what you said and do HIIT on one of those days. I wouldn't even consider it dropping an upper body day. You'd still be working your upper body, but just be doing it more aerobically.
 
Well, that's not entirely true, you will still burn fat before 20 minutes. Within a certain heart rate range, the percentage of fat being burned will increase. If your "fat burning system" didn't start up until the 20 minute mark.... well, you just wouldn't make it to 20 minutes... maybe about 2 minutes or so.
 
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