Well, I'm not much help since I haven't personally had this experience. But I have sisters!
I was going to buy a jogging stroller for one sister and she said that they are not safe for the CHILD until they are at least 12 months (or maybe more?). I'm sure there's literature that came with the stroller that could tell you specifics.
I can't tell if you are expecting our just had your child from your message. However, in either case the advice I've heard will say its safe to do any activity you did prior to becoming pregnant but don't add intensity, distance or push yourself too hard. My personal GUESS might be sprint distances OK, ironman distances not so recommended. My sister swam all the way up until her delivery date and used the elliptical machine in place of running up to about 2 weeks before her due date. I think I heard from her, she was allowed to safely incorporate activity again after 6 weeks. But that might have been specific to her delivery conditions (ie, I don't think she was allowed to swim with her stiches until that time.) I would ask your doctor.
In any case of when she was allowed, she has since not gotten back to any real training regime aside from an occassional run, swim, or gym session (she doesn't cycle) since the baby was born 11.5 months ago. Being a new mommy is exhausting especially with a 3/4 time job. And I can vouch from auntie experience, those little 12 lb suckers (my nephew was 11.5lb at birth) quickly grow to be 20 pound suckers that need to be carried/bounced/etc. and before you know it you've strained your shoulder muscles so badly playing "bouncy" with your 22 lb nephew in an afternoon auntie outing you can't lift your arms above a certain point or swim for a week! I can only imagine that 24-7.
But if you have a will, you'll find a way. Do things to burn energy that don't make you feel so icky. And ask your doctor with questions.

You probably won't need to wait a year to put your kid in the jogger. It is generally considered safe to put children in a jogging stroller when they are able to hold up their head, which could be as early as 3 months. Good luck!

O.K., so I went and found out my own information. (I don't know why I am so obsessed with this, I'm just trying to be helpful.)

The American Pediatric Society does not recommend using a jogging stroller until the child can sit up on their own completely unassisted (no topple-over checks). This is an issue even when reclining. This is usually right around 6-7months.
However, what my sister was reading pertains to literature she found with the stroller manufacturers. This says not to jog "off-road" or use in rough or gravelly terrain until the child is at least one year. I know the roads near her house have the very gravelly type of pavement: great for winter traction but it is not a smooth ride like most other pavement types. There are no sidewalks near her house so she has to use the edge of the roads coupled with the gravel and debris that collects there.

But certainly you can still go excercise without your little one!

Thank you all for your feedback! I'm not due until Nov 9th so I have a little while longer to go. But I do plan on taking my little guy on walks, not jogging with him until he's ready.

I tried to keep doing my spin classes early on but they were uncomfortable and I can't even imagine doing them now. I also can't run because my heart rate gets too high. It normally stays in the mid 170-180's and that was before I got pregnant. In the first couple of months after I found out we were expecting it would shoot up to 185 easy and would't go down unless I walked and dr said that it wasn't safe to keep it that high.

I'm hoping, depending on how this little guy comes out, to start running again about 6 weeks after we have him and I would like to do a couple of sprints in May/June timeframe. Running is top on my list, right after a medium steak and a margarita/beer though!

Thank you all for your advice though, I appreciate it!