Hello My name is RainingRoyal im not very new to this community but i wasn't active for a very long time, so as a gift im doing a guide for 99 strength.The ROYAL way 
This was when i was a newb to the game up until about 70 strength. anyways lets go!
1-10 strength!Cows are your best option here if you are just starting out, and remember to bank the cow hides.
10-20 strength!I done Chickens as the feathers gained me some cash for my scimmys thats i used.
20-30 strength!I went down to the stronghold of security in barbarian village and pwned some mintour until 30 str
30-40 strength!I trained on varrock guards 30-40, the exp isn't too bad just depends what attack level you have aswell, just use the best scimmy you can.
40-50 strength!Kinda a breeze at 30k exp p/h at stronghold of security (2nd floor)
50-60 strength!do the same as 40-50 as you get around 35k exp p/h
60-70 strength!Now the fun starts as you can hit fairly high now, if your a member move to rock crabs/yaks. If your F2P Move down a floor of the stronghold and fight the giant spiders for 40k xp p/h
70-80 strength!Now for F2P you should do the giant spiders until 99. If you P2P then if you've done the lost city quest, kill otherworldly beings
now from 80 i carried onto to do otherworldly beings as i wanted some profit from the runes, but if you want exp do soulwars, or rock crabs/yaks
Thanks RainingRoyal
oh and any questions pm me, here is a link to my adventure log for proof of my 99

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http://services.runescape.com/m=adventu ... Name=raining&submit=and if this is in the wrong section please move it ;D