It looks very plausible that stretching before you exercise doesn’t do much for you. Multiple older surveys suggested this.
Annoyingly, the studies linked in the previous paragraph are 2 decades old, and somehow I can’t find a large, well controlled, trial.
You shouldn’t be doing any exercising without a bit of warmup cardio. I do a 5 minute walk/jog starting at 2.5mph and going up 0.5mph each minute.
But you can do pretty much anything. Stationary jogs, high knee steps, laterals, jump-rope, etc.