Stats:

6'4 235 (about 20% body fat)

Started 5x5 two months ago with just the bar.

Current lifts (all 5x5):

Squat: 170

OH Press: 100

Deadlift: 225

Bench Press: 125

Barbell Row: 110

Schedule

Monday - Squat, OH Press, Deadlift

Tuesday

Wednesday - Squat, Bench Press, Barbell Row

Thursday

Friday - Squat, OH Press, Deadlift

Saturday

Sunday - Squat, Bench Press, Barbell Row

Following Week would have Monday off and start Tuesday with Squat, OH Press, and Deadlift.

I've made excellent physical gains over the past 2 months. I'm stronger than I've ever been.

Question:

While I have lost a good amount of weight, about 30 pounds in the last 3 months I have noticed my cardio is still pretty bad. I get winded from a light jog or running up a few flights of stairs. I do have a spin bike (Pelaton equivalent made by Nordic track) I can use to start building cardio. Would it be wise for me to start adding a 30-45 minute spin on my off days? If not, is there another excise I could add?