Doing cardio after leg day won't kill your gains. In fact, certain types of cardio may actually help rather than hurt muscle growth.
Should You Do Cardio After Leg Day? What the Science Says
Two Research-Based Reasons Not to Skip Leg Day - IDEA Health
Articles
Weights vs. Cardio: Keep Them Separate or Combine?
Working Out When Sore: Benefits, Risks, When to Seek Help, and More
Cardio before vs. after weight training: Which is the more
Best Leg Workouts (4 Exercises For Thicker Quads)
Weights vs. Cardio: Keep Them Separate or Combine?
6 leg day mistakes you're definitely making
The Best Leg Day Workout Routine For Muscle & Strength – StrengthLog
12-3-30 workout: 'I tried it everyday for a week, does it work?
The Best Leg-Strength Workout for Athletes
Never Skip a Leg Day: Benefits, Cautions, and More
Why You Should Choose Intensity over Duration