for the tummy-----pull in your stomach as far as you can and hold for a count of 6
--sit up with your knees bent then "roll down" to a lying position very slowly (like backwards sit ups)
--lie on your back with your knees bent, feet flat on the floor and clench your pelvic floor muscles then push your spine to the floor (or whatever your lying on)
for thighs------stand with feet hip width apart and squat as if you're going to sit on a very low chair, you may need to hold your arms out for balance
--lunges=standing up take a largeish step forward and lower your knee to about three inches above the floor (back foot will be on tiptoes, front foot will be flat)
for bum------clench your bum for a count of 30
--lie flat on your front and lift one leg then gently lower to flat again, repeat with the other leg, keeping your hips in contact with the floor (or whatever you're lying on)
--get on all fours and push one heel up to the ceiling, squeeze you're abdominal muscles as you're doing this, and when you're heel gets to the top squeeze youre bum muscles do a set of reps. before repeating with the other leg
for all exercises repeat as often as you can [minimum of 15 for each id recommend]