Hard to beat two clicks on the mode button, then one click on start button to start the last timer I used. Just an uncustomizable appliance, which is nice when I don’t want to fiddle with something much.
On the other hand I can’t fathom a better workout partner than my Apple Watch. A few seconds from racking the weights or whatever I can fire up my rest timer with 1 press and mute the vibration with another press when it’s time to get back to lifting. This works great when you want to do some interval of rest paired later with intervals of activity. Having favorited a few timers I can reach them within 1 to 2 presses. I haven’t found a similar watch with a range of timers that are as easy to use.
