the last 20 minutes

ive just spent 20 minutes doing sit ups. i did 70. i think. i lost count but i definitely did at least 70. and by my calculations thats just over 17 seconds per sit up. although i didnt do them all in one go. i did 20 had a short rest. tried to do another 20 but stopped at 10 and had a longer rest. then i tried to do 20 again and i couldnt get past 18 so i had another long rest and then did 12. which, now i add them up is actually 80 all together which is 1 per 15 seconds. on average. i also bought a full length mirror today. cos im sick of trying to see what i look like in the one above my sink cos i have to stand on the toilet. and i have come so close to breaking my neck.