Am I over doing it?

Hi all,

I'm a 26 year old male, I weigh 13 stone, I'm 5 foot 10, and 4 weeks
ago I started running on my girlfriends threadmill. For the first 2
weeks I jogged for 20 minute, last week for 30, and this week I'm on to
40. Prior to this, I didn't exercise formally - just walking around 40
minutes each day.

When I start running on the treadmill each day, I get a pain 2 inches
below my left nipple after about 20 seconds of running. This stops
gradually after about 2-3 minutes or so.

During this week I've even started getting this pain while walking to
the shop.

Lastnight I woke up and felt that my heartbeat was still running kind
of fast. Perhaps I don't wind down enough after exercise and perhaps I
shouldn't be exercising at 10 when I plan on going to bed 3 hours
later. When I wind down I normally walk outdoors for 10 or 15 minutes.

When I finish my jogging, I don't feel that out of breath. Most of the
fatigue is in my legs. So for that reason I'm not sure if I'm overdoing
it or not. The threadmill has a heart monitor built into it so perhaps
I'll check my heart rate as I run. What rate should I stay below, and
what should I do to stay below it - start walking rather than jogging I
guess.

Thanks for your help,

Barry.

.

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