Why do Muscles Shake During Difficult Boot Camp Workouts?

While it could cause a moment of fear – quivering of your muscles after a difficult workout – the physical reaction is actually something good. It is a sign that your body is responding positively to the workout and is gaining in strength. So there is no need to panic and speed-dial your Dangerously Fit – Personal Trainers Sydney. Those quivering muscles are telling you that your foundation is being reinforced, and your workout has been successful.

Kettle bell Workout

Reasons why muscles shake:

  • When the muscles get really tired after a boot camp workout, they become acidic because of accumulated hydrogen ions. For instance you are into a third round of planks. You may begin to feel a bit wobbly. This is because of pain in the muscles, causing discomfort. When this happens a message is sent to your brain telling the body to take a break. It is a situation where you are overcome with fatigue. As you progress in your workouts and your body gains in conditioning and strength, onset of any such fatigue attack takes longer to happen. If your body is well conditioned you will experience good nerve recruitment – negating such muscle quivering.
  • Another cause for muscle shaking is when you start a new workout which is challenging. This is because of the motor patterns in the brain which relay commands when walking etc. When you indulge in a new demanding activity such as split squats your brain has to decide how to control the same. Muscle groups have to work in tandem to perform the new activity and this can result in a bit of a shakeup. You can experience this type of muscle quivering even if you have had a long break in between workouts. The return to working out can result in homeostasis – meaning the system is subjected to shock due to disruption, in turn resulting in such shaking response.
  • Proper breathing technique is very important when working out. If you hold your breath your body undergoes stress and you will experience muscle shaking. You need to relax and breathe normally. If you do experience any muscle shaking, you should change your breathing rhythm to normal and the shaking will stop. Recovering post-workout is also important. About half an hour after exercising you should replenish the glycogen in your body with foods that are muscle-building. This will ensure you are stronger and fresher for the next workout session.
  • Every workout needs to be undertaken with caution and care. If after a heavy session you feel muscle shaking taking place, remember in some instances it could be dangerous. If you are doing weight lifting and the muscles quiver because of the force you are putting on them, you may not be able to control the same. It is then time to stop. Some workouts like lunges could be improved by adding a bit of weight for better grounding and balance. But here too, if the weight is on the heavy side you could lose your balance and be prone to injury. So in such a case it is time to stop.


The above tips should help you to know when muscle shaking is good or bad during workouts. If you have any doubts you should check with your Dangerously Fit – Personal Trainers Sydney who is qualified and experienced enough to put you on the right track.