No. I’ve tried implementing an in season weight program and besides the logistical nightmare what I found in most of our kids couldn’t even control their body weight very well (this is a group of 50 or sprinters, jumpers, hurdlers, vaulters). It was pointless trying to teach a loaded squat or bench when most kids couldn’t do a good body weight squat or pushup.
We develop body control, coordination, strength and power through general strength type activities. This includes: partner medicine ball passes, bodyweight exercises (pushups, dips, lunges, squats, etc.), explosive med ball throws and jumps, various skips and jumps and hops, ab exercises, planks ,etc.
That said, there are some athletes I have/had that were much further along so in addition to the general strength stuff listed above they’ve done weight training in the off season. Even that though was very basic in nature.