Ultimate shoulder rides

Two months ago my wife and me were on our vacation in California and there i saw most impressed thing in my life:tall,big woman (about 5'10'' and 200)riding on her 12 y.o. daughter's shoulders.First time it was in a pool for some chicken fights for some minutes.Somedays ago we met them in the deserted beach near our hotel and...feel my amazement she again was on her daughter's shoulders,it was absolutely common thing for them as they salute us and we're keep walking together,i mean we three walking and Amanda riding on her daughter's shoulders,about 20 minutes ago she noticed my wife interest and offer her to take a ride,at firstly Daniella was confusion,but considering Mellisa wasn't seemed tired and fact that she 75 pounds lighter then Amanda she agreed,Amanda got off her daughter's shoulders and Daniella take her place.Amanda smiled and said ''i give you my horsey,so i wanna take your's'',Dany said ''o'k'',so i kneeled down and Amanda got on my shoulders,OMG,she was so heavy,i don't know how 12 y.o. girl can take it for so long time,after about 10 minutes i got very tired and Daniella noticed this and got off from Mellisa's shoulders,Amanda get off mine and came back on her place on Mellisa's shoulders and rest of walk (about 30 minutes) she ride on her daughter's shoulders.When I asked Mellisa how she can fit this she thought some seconds and said ''don't know, it's easy for me''