@nuela, brisk walk, squatting, jogging on a spot for few minutes, using d thread mill etc. U can research more on this.

Mild exercise like wot cos I HV d same issue here

Tying tummy is not an option for someone who had CS. Besides, tummy tying wont make u loose excess tummy fat. Eating healthy and doing tummy exercises will perform d magic. So give ursef time as u cant do any tummy exercises for now due to d fact dat u had CS done. Wait till ur baby is year, so there wont be strain on d scar. Focus on eating healthy for now, breastfeed ur baby exclusively cos it helps shed some baby fat and do some mild exercises when ur baby is 3-4 months old. All d best!