Hi welcome to HCM I have gone thru your query regarding stomach pain caused by sit ups . It is a matter of concern . But dear ,you should not worry . You can lie down straight , loosen your body and relax for some time , then do tummy in - out exercise .. I hope you will recover fast . Take lemon juice with a glass of warm water and a pinch of salt and pepper . It is suggested that , whenever you start exercise , start slowly and incease gradually . For your info Every day, we are bombarded with toxins in our environment and in our food which is why detoxification is such a critical process in your body. If the detox process is hindered, toxins will build up in your body eventually causing acidity and toxemia. These are the root causes of nearly all diseases Gulping on only medicines will not help if you don t modify your life style and food habits . Slow motion action is permitted till the problem persists . There is no better option than physical exercise. walking is the best exercise to begin with also gives you well shaped body . Modification in your life style , food habits -include healthy diet as fiber,vitamins minerals ,cheeze, milk , supplements full of antioxidents , in natural form --fruit ,green veges , lemon , ginger ,garlic , Aloe vera , Turmeric powder a level spoon + almond oil a Tspoon with hot milk .with required work out ---- Regular walk, Exercise & Yoga posture , Dhanurassan Bhujjangassan , from left to right stretching , while lying on the ground , or any posture which gives you relief . Avoid processed foods carbs , sugar , fried ,fast foods , Tea , coffee ,alcohol and smoking , stress and Constipation all will produce biochemical and metabolic conditions in your body that will decrease your immunity, so avoiding is definitely the first step in the right direction to detoxing the body, boosting the immune system . All are the pillers of our strong immune system responsible for healthy disease free life Always remember, if pain is severe or incapacitating, please see your doctor / professional Hope this helps solves your query .Take care .All the best .Get well soon Don t hesitate to come back in case of any further query .