1️⃣ Do cardio on rest days to speed up recovery and reduce soreness.
2️⃣ To avoid muscle loss, do cardio and strength training on different days.
3️⃣ Aim for short recovery workouts with low-intensity cardio. Avoid high-intensity training on rest days.
Can You Do Cardio on Rest Days?
We recommend that you do cardio on rest days.
It's a great way to reduce soreness and recover athletic performance.
Low-intensity exercises like light jogging, cycling, or swimming are ideal for rest day workouts.
What It Means to Take a Rest Day
A rest day is when you take a break from regular training. Your muscles get damaged during intense workouts. Afterwards, your body needs to repair and recover.
On a rest day, you can choose between two types of recovery: passive or active.
Passive recovery means you unwind, abstaining from any physical exertion. At most, you might get a massage, do cryotherapy, or stretching.
Athletes have used active recovery since the 1980s to improve their performance .
Here is an infographic comparing passive recovery and active recovery:
You should avoid intense physical activity whether you choose active or passive recovery. For example, weightlifting or high-intensity interval training.
The Science Behind Cardio for Faster Recovery and Reduced Soreness
Doing cardio on rest days is a form of active recovery that speeds up muscle recovery.
The research on active recovery says:
- It can reduce muscle soreness (Delayed Onset Muscle Soreness - DOMS)  .
- It might boost athletic performance .
- It makes you feel more recovered, which motivates you to perform better .
We recommend adding active recovery to your rest days. A short nature walk, jog, or hike is an excellent way to recover. It will help ease muscle soreness.
Does Cardio Burn Muscle?
Luckily, there are science-based strategies that prevent cardio from killing your gains.
When Cardio Prevents Muscle Growth and Strength Gains
- Timing: If you do cardio right before, during, or after strength training    . The negative effect is strongest if you do cardio before strength training 
- Volume: If you do excessive amounts of cardio  .
- Intensity: If you do high-intensity cardio   .
- Training Experience: The more trained you are, the stronger the negative effect is .
- Body part: Lower-body cardio reduces lower-body strength gains .
This is known as the “interference effect” because cardio can interfere with strength and hypertrophy.
To avoid this, you want to balance strength and endurance goals. The interference effect can be mitigated if you plan cardio properly into your training program.
How to Prevent the Negative Effects of Cardio
You can prevent the negative effects of cardio if you do it on separate days from strength training. The next-best option is to separate your training sessions by at least six hours .
You are even safer if you do low-intensity cardio and limit it to a short duration.
For example, go for a light jog or swim for less than 20 minutes on recovery days.
None of this is to say that cardio is harmful. It has a host of health benefits. Cardio is only negative in the sense that excessive cardio can slow down muscle or strength gains.
You shouldn't worry if you are an endurance athlete.
Our advice applies to gym goers, weightlifters, and bodybuilders whose primary goal is strength and muscle gain.
It also applies to any sport where you are trying to maximize muscle mass and strength, such as American football, wrestling, or MMA. But it depends on which weight class you are trying to reach.
Still, the interference effect is small. Don’t worry about it unless you do large amounts of intense cardio right before, during, or after your strength workouts.
How to Add Cardio to Your Rest Day Workout
Here is an infographic showing how to plan cardio into your training program:
The Type of Cardio You Should Do
Feel free to choose whichever type of aerobic exercise you prefer. We recommend cardio that is light on joints: swimming, cycling, or running on a soft surface (i.e., nature trails). The intensity should be around 30 to 60% of your maximum heart rate.
Adding mobility training to your active recovery workout is also a good idea. Try stretching, mobility drills, and so on.
Since it’s a rest day, you should avoid intense physical activity:
- Interval training
- High-intensity exercise or sports
- Weightlifting and strength training
How Much Cardio You Should do on Rest Days
As discussed before, only 6-10 minutes of cardio gives performance benefits .
- Short workouts (less than 20 minutes of cardio)
- Light cardio such as jogging, swimming, or cycling
- Maintain a low intensity
|Example of a light cardio workout on a rest day
A 10-15 minute jog in the park or a ride on a stationary bike will suffice. Maintain a steady heart rate. Active recovery reduces muscle soreness and can potentially enhance athletic performance.
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