The reason being is because leg workouts and cardio exercise both use the same fuel known as glycogen.
Can i do cardio after leg day. Cardio after leg workouts has benefits. Go as low as your body will allow but once youre at parallel youre not losing by going any deeper. Cardiovascular Exercises For Heavy Trainers.
You can do it I dont see why you dont just switch your workouts around to avoid doing it personally thats what Id do since chances are a potential cardio session after leg day would be worse than after a non-leg. There is a bunch of benefits doing cardio after the leg day. Research suggests that quadriceps activity peaks at 80-90 degrees basically when your upper legs are parallel to the ground while the glutes peak slightly lower.
Your leg muscles and glycogen stores need to be replenished and you cannot expect a great performance on the squatting rack if you went all out on cardio training earlier. However you will definitely want to do the weight training first. You dont want to pick cardio activities that breakdown your muscles even more.
Is it OK to do cardio after leg day. The good news is that even if you do both types of training simultaneously you can still grow big and strong only slower. That means that you should never run on a leg day but wait at least one day instead.
Strength training and running go together like peas and carrots and complementing your training with strength and cardio is perfect for your training goals. You cant expect a good performance on the squat rack if you went all-out just 12-24 hours earlier. Simply put yes you can do legs and cardio on the same day.
All pain no gain. You may have to put some days between your leg day and cardio day to avoid injuries because of overstretching. You could do a jog in the morning and your weight training exercises in the afternoon.