Well a stone my friends, apart from being a small rock , is approx 6.3503 Ibs. So 17 stone 4 Ibs is approx 109.55 Kgs! (A bloody big rock)
Don't you mean 14
lbs to the stone?
Don't worry about the exercise. I'm a fraction under 13 st (181 lbs to be precise) but I'm only 5' 8" (and I ain't doing a metric conversion

). I was nearly 15 st once