Thanks! The last two cardio workouts I've done, instead of increasing my time, I've increased my incline (on the treadmill) and the resistance on the bike. Makes for a more intense workout without leaving me exhausted :)
You can only know when to increase based on what your body tells you. Also, instead of focusing on time for cardio, try pushing yourself to a more intense workout. Do 20 minutes at a higher pace with a steeper incline. It's not always about the amount of time, but the intensity.
As for strength, ideally you should be lifting to fatigue. Use a weight that you can only get about 12 reps at. If you don't have access, you can do more (that's what I do. I'm dying for some higher weights, hopefully this weekend!) but going heavier for less reps will build more than higher reps with lower weight.
I'd focus on the quality of your workout rather than quantity. So you could increase the intensity instead of adding on more time and get just as good of a workout. Don't feel like you always need to add more time.
You won't always feel sore the next day, but I agree with the previous poster that you'll want to be sure you're using a weight that's challenging for you.
For question number one, adding time is to build endurance not increase your way to fat loss or fitness. Never substitute duration for intensity, use quality not quantity so increase your intensity first then move up.
For question number two; it is important that the weight you use challenge your muscles to the degree than you can only do 8 to 10 repetitions with proper form. Doing more repetitions means the weight is too light to provide the needed challenging work to help you build strength and increase muscle function.
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One rule of thumb is the 10% rule - don't increase your duration/speed/distance/weight/etc by more than 10% per week. So tacking an extra five minutes per week on over the course of a month would probably be a better bet than throwing another 15 minutes on at once.
I don't follow that exactly to the letter (I might round up a bit), but I've found it's a decent guideline to follow.
1) When do you increase the cardio minutes? The reason I ask is because I went from 30 minutes to 45 and then felt dizzy and winded. Probably due to the fact that I'm still a beginner (less than a month exercising). I guess the reason I want to know is so that I maximize my cardio to reap the benefits. But I know 45 minutes is too much too soon for me.
2) When I'm strength training, I don't feel very sore the day or two after. Am I doing enough? Or is that normal?
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