In order of most to least frequently used:
Bicycling - Not current, but not past either. I own (3) bicycles, plus a bin of parts, and clothing to ride from 30 degrees to 100 degrees. I have been riding on the trainer and try to ride weekly in the summer.
Golf - I have (2) sets of clubs and really need to part with my old set (SOLD May 2021). I try to hit balls or play weekly in the summer.
Coin Collecting - This is more of a financial investment than a space investment, but I still have managed to stash 60+ coins in a safe deposit box and have a bin of stuff in the house. There is the significant investment in a numismatic library as well. I attend the Denver Coin Expo annually and follow the major auctions.
Scuba Diving - I have one tote of gear, plus fins, 3 mm wetsuit, 7 mm wetsuit and BCD. I dive about 4 times annually.
Skiing - I have all of my ski gear, plus a back up pair of skis and an old set of bibs. I ski about 3-4 days annually.
Tennis - Just one bag of tennis stuff, that I will keep for a while. I would like to play a couple of times per month, but this year not so much.
Camping - One tote, plus a couple of tents and a camp stove. This seems like a long term holding as well. We camp maybe once per year.
Swimming - I surprised myself by having a full tote of swimming stuff plus a backpack. Items include goggles, pull buoy, paddles and other random training tools. I have not been in the pool in over a year.
Shooting Sports - I somehow managed to accumulate a shot gun, Ruger 22 caliber rifle, (2) WWII rifles a Mosin (SOLD) and a Swiss K22 (SOLD), a Colt 357 King Cobra, a Taurus 380 and a Smith & Wesson 22 caliber handgun. I have a reloading press and a host of supplies (SOLD). I have not been shooting in over a year.
Climbing Gear - I only have one bin of climbing gear, but I really don't see myself doing much climbing in the future. I have not been climbing in several years.
Softball - Just one bag of softball gear, that I will probably keep for a while. I have not played softball in several years, but me and the girls did throw the ball around.