Exercise is known to be beneficial for the body and fitness. However, it may not always be ideal because of existing health conditions, and experts say fitness enthusiasts must be mindful of especially their heart while taking up a fitness regime. 

Stand-up comedian Raju Srivastav was reportedly running on the treadmill when he suffered a cardiac arrest and was rushed to the All India Institute of Medical Science, Delhi. Srivastav, 59, continues to be "critical and on ventilator".

"If someone above the age of 50 years is starting to go to the gym, then it may be better to get yourself checked by a cardiologist or do a stress test," said Dr Tilak Suvarna, senior interventional cardiologist, Asian Heart Institute, Mumbai.