You can get both of those things for a reasonable price @Baraka Sports their treadmills range from 2500 - 380 JD their bikes range from 350 - 130 JD check out their website to see what they offer
You can find dictionaries for Arabic to English at several places like @Readers or @Books@Cafe or @The Good Book Shop and surprisingly you can find then at smaller bookshop especially along University Street
Well the actual Nike store doesn't even sell it so it clearly isn't something easy to find. Sure you can find it but it's not easy you need to randomly find someone selling them and since you supposedly only have like 4 days it doesn't seem possible. Sometimes for a reliable resource you should just order online
Al Kildani - There's this little workshop on hamra street sweifieh (right opposite boston fried chicken) on the first floor. It might feel a bit sketchy to get into at first but the tailoring is impeccable and they specialise in jeans and pants! It's a loud and crazy place, if you have trouble finding it just ask any of the neighbouring shops!