I agree with Tom. BUT...My biggest thing is listen to your
body. There is no reason for you to wake up sore after a workout. What your
body is telling you is you over did it. I like to say wake up with awareness. You are aware you worked out but you can get out of bed and go on with your busy day. How do you get to this point... well you have to start somewhere. If you are using light
weights I would suggest going up in weight but then again listen to your
body. If you can only complete 6 or 8 repetitions in good form and your muscles say enough... put those
weights down and pick up the lighter
weights and finish your exercise until the muscles are fatigued. The next time you do that specific exercise you will be able to add in 1 or 2 more repetitions.
As far as aerobic activity walking verses running... start out walking and let the
body get used to it. Warm up and walk 10 minutes then jog for 20 to 30 seconds and see how that feels. go back to your walk for a few minutes then add in 45 seconds to a full minute of jogging again. walk for 3-5 minutes and then go for another minute of jogging. If you build the
body up slowly you will avoid injury and you will be training your
body for future running.
The next time you walk instead of 1 minute try for a minute and a half to 2 minutes. with walking inbetween. Any client that I train that has more than 20 lbs to lose I train them this way. the additional weight on the joints can be harsh. This again will prepare the
body and you can avoid injury.
I hope that this helps.