Here's a construction Paul uses in Phil. 4:9.
The "these things" (tauta) refers to all the truths the Philippians had learned from Paul. Now they are to prassete them -- live them out by constantly putting them into practice.
The verb prassō occurs 39 times in the New Testament. Paul uses it 17 times, usually in contexts dealing with practicing things that are in accordance with God's will. Previously in Philippians, Paul used two other verbs with the same basic meaning:
"Live" (1:27).
"Walk" (3:17-18).
Such living, walking, or practicing is the necessary balance to the "thinking" the Philippians are to do. Right thinking should always lead to right practicing. It does absolutely no good, for example, to take Greek in seminary and then never use it in your personal walk with the Lord or in your sermon preparation. Living faithfully before God always involves ethics. It is one thing to know Greek, but it is another thing to allow the language to flow out through your life. And this outflowing must be constant.
In Phil. 4:9, I think this point is missed in the CSB ("do"), ESV ("practice"), and the GNT ("put into practice"). The verbal aspect of the imperative prassete is clear: this is something we have to keep on doing. Hence the ISV's "keep practicing" (cf. "keep putting into practice" in the LB and NLT). The idea of "keep on doing this" is not foreign to the Greek. Quite the contrary. It is part and parcel of the verb. So to undertranslate it does no one any good at all.