If you really want to maintain a solid 'cardio' program it should NOT look like this
- Gym
- Go home after the gym and wait till next training day
It should look like this for a 4-6 week period with variation for the next 4-6 weeks:
- Gym (Frequency should be 3-5days/week, BUT periodized!!!)
- Day of cardio in the form of aggressive ZONE 2
- Day of aggressive ZONE 5 training
Walking is fine but there needs to be progression. That progression can be 'rucking'(weighted vest), 1 minute sprints on a rower with a 30 second rest, 10x. I ruck outside or treadmill. While on t-mill I will randomly change the elevation every 2 min for 45 min. I recently added basketball. That's right! I simply, solo, outside, play full court for 15 minutes with 3 minute rest for 4 quarters. I wanted to challenge my fitness, coordination, and it aligns with my philosophy of enhanced fitness by playing! Try it! IT doesn't have to be my program but think about what else could you do to supplement what you do in the gym. PS: This is key to weight loss/management too!