Your body needs recovery time. You're going from resistance training to cardiovascular training on the same day. Your body is going to be taxed out. Separate the days you do weights and the days you run. Hydrate yourself constantly and feed your body some nutrient dense foods that contain good lean protein, fibrous carbohydrates (fruits … Read more

Increase the intensity of the workout. For an example, instead of doing 20 squats and resting for 2-3 minutes per set, do 10 squats, rest for 30 seconds, then another set, rest for 20 seconds and then another 10. You repeat that 3 times and your heart rate would be through the roof and increasing … Read more

It depends on how you define "stress". Any kind of exercise puts stress on the muscle when it comes to physical training. I'm thinking you mean pain. There are many bodyweight exercises that you can do that engages the abdominal wall without adding discomfort. Using an exercise ball and doing crunches is a great exercise … Read more