It's Spring! Sometimes your bike is just happy to see you!
But I've flipped a bunch of bikes, and there can be a bunch of energy lost in the drive train.
Pull the chain and check it for movement. While it's off, check the spin of the crank and pedals.
Spin the front and rear wheels - Shimano used a white grease for a while that slowly hardened into plastic.
A lot of modern bikes also come with the wheel bearings way too tight as well.
Spin the rear wheel while holding the freewheel / freehub still - more hard grease possible there.
Check for wheel wobble dragging on the brakes.
(important!) Check the spoke tension. Bikes always have slack spokes, and they absorb energy. A spoke job usually made old bikes feel like new!
So if the drag is out of the drive train, check the rider position. Since you have a couple bikes, pick your quickest and set the others up next to it (aligned on the BB) and see if the bars, seat, and BB are all in the same relationship.