One of the most common questions I get asked by new mums is when they can start running again after having their baby. Of all the exercise options available to new mums, running definitely seems to be the most popular and I can completely understand why:

  • It’s free, which after shelling out for a lot of new kit for the baby is an important consideration.
  • It’s convenient, no need to worry about scheduling childcare or booking into a crèche, you can fit in your exercise as soon as the opportunity arises.
  • It’s easy, when you are living in a sleep deprived fog you just want to be able to do something that does not require a lot of brainpower.
  • It’s uplifting, even a quick run provides a surge of endorphins and some much needed headspace.

However, probably a lot of mums would also say that part of their reasons for running were to help lose the baby weight and to improve their cardiovascular health. Sadly, running is probably one of the least effective forms of exercise for achieving these goals and that is especially true for new mums.

In terms of weight loss, running is not a particularly effective form of exercise for a number of reasons. Studies have consistently shown that strength training is far more effective at targeting fat and boosting metabolism than running. An exception to this is if the running is done in the form of short sprints in interval training. (This would be completely inadvisable for postnatal women for reasons I will come onto later.)

One of the reasons why strength training is so much more effective than running is that the average person gains 1 pound of fat and loses 1 pound of muscle every year after 30.  We tend to lose muscle each year because we aren’t showing the body that it is necessary to maintain it (by doing things like strength training). This decreases our metabolism and reduces our daily calorie expenditure (body fat burns 2-4 calories per pound per day compared to 6-10 for muscle). We have included low impact strength training in our postnatal programme to help you tone up and safely lose weight. You do not need to worry about ‘bulking up’ - women naturally have higher oestrogen levels that prevents bulky muscles.

Regular cardiovascular exercise may actually cause the body to drop muscle in order to become more efficient, as the lighter you are the faster you can run. It could also cause extra calorie consumption (your body tries to maintain homeostasis so if you burn more energy your hormones tell your brain your body needs more energy so it increases your hunger signals – this is quite often why a trip to the gym is accompanied by an increase in appetite!  This is fine if you are maintaining a regular exercise schedule, but quite often this is tricky during the early postnatal period in particular. Also, studies have shown that most people tend to overestimate the calories they have burned through exercise; yet underestimate the calories they have consumed.

So, running does not score great points in terms of weight loss. For new mums in particular it is also one of the worst ways that you can improve your cardiovascular health. During pregnancy a hormone called relaxin is released which helps make your ligaments stretchy and elastic in preparation for childbirth. Relaxin affects every joint in the body and it can take up to five months for your ligaments to get back into their original positions and stabilise. As a result, your joints may be weaker than usual, increasing the risk of your ankles, knees, hips, pelvis and spine weakening under impact. Therefore you are at much greater risk of injury then previously, particularly for high impact sports such as running.

Another reason to be cautious about running is that any high impact activities increase intra-abdominal pressure. This pressure needs to be contained within the abdomen by the coordinated action of the core muscles – the pelvic floor, diaphragm, deep abdominal and multifidus. These muscles have been weakened during pregnancy, meaning that the increased intra-abdominal pressure often leads to increased stresses on the linea alba, the connective tissue running down the centre of the abdomen. This can exacerbate a condition known as diastasis recti (see our blog about it here).

One of the main muscles that has taken a hammering during pregnancy and delivery is the pelvic floor. Even if you had a caesarean section these muscles will still have had to support the increasing weight of your baby over the last nine months. Your pelvic floor muscles stretch up to 3 times their normal length during birth, and you may have sustained deep muscle tears, particularly if you had a surgical delivery. Running places huge stresses on these already weakened muscles. To put it into perspective you could think about the g forces involved. Standing is a 1-G activity, walking is a 1.5-1.75 G activity, whilst running is a 2-3 G activity. If you load these lengthened tissues too early, you will damage them further leading to pelvic organ prolapse (POP), stress urinary incontinence (SUI) and low back  and pelvic girdle pain. It is NEVER ‘normal’ to leak and this is a very clear sign that you should reduce the intensity and start focusing on improving your core strength.

At this stage I should admit that I love running and completely sympathise with those of you who cannot wait to get back to it. If this is the case here are Mama on the Move’s guidelines on returning to exercise:

Firstly, it is important to check with your doctor, midwife, physiotherapist or continence professional before returning to sport or exercise after the birth.

0-3 weeks postnatal

  • Walking
  • Postnatal abdominal hollowing
  • Pelvic floor exercises

3-8 weeks postnatal

  • It is recommended you wait until your six-week postnatal check before starting a group exercise program or going back to the gym
  • Walking
  • Low impact aerobics or postnatal class
  • Low intensity water aerobics class and swimming (once bleeding has stopped)
  • Gym program (maintain posture, light weights, no breath holding)
  • Postnatal abdominal hollowing
  • Pelvic floor exercises

8-12 weeks postnatal

  • Follow the guidelines for 3-8 weeks, gradually increasing your intensity and weights
  • Progress your postnatal abdominal hollowing

12-16 weeks postnatal

  • Consider visiting a physiotherapist for a postnatal abdominal muscle check and pelvic floor muscle testing before returning to high-impact exercise, running, sport or abdominal exercise programs.

After 16 weeks postnatal

  • You can return to previous activity levels provided your pelvic floor muscles have returned to normal and you are not experiencing any back pain, vaginal heaviness, or urine loss during or after exercise.
  • Seek further advice from a health professional if your symptoms persist

Other factors to consider

You may feel more tired in the first few months after having a baby due to interrupted sleep, the extra demands of motherhood and breastfeeding. Fatigue and over exertion during exercise can increase the risk of injury. It is important to listen to your body and how you are feeling. Be aware of any warning signs of pain or discomfort and, slow down if necessary to allow this to subside, rather than pushing through the pain.

While you are learning to breastfeed (if you are breastfeeding) and looking after your baby, you may not have the desire to exercise in the first few weeks or months. During this time you can still be strengthening your abdominal and pelvic floor muscles in preparation for when you do feel ready to return to exercise. You may find that walking is an exercise that will get you out of the house and one that you can do with your baby, and maybe your partner or a friend.

Tamsin x


1 reply

Trackbacks & Pingbacks

  1. […] health physio who can help enormously by checking your pelvic floor activation. See Tamsin’s blog here on more details on when it’s safe to run after having a […]

Comments are closed.