The best thing about TRX is you can get a decent workout in your basement, or anywhere really. A full fledged gym plan would be great. But I get plenty of value from just doing a handful of basic exercises 3x per week at home. Everyone should have some TRX straps! (Or, get knock offs - there is no magic to the TRX brand. There are even directions online on how to make your own set for about $15)
BTW - Suspension strap work can be tough enough that you never have to “transition” to weights.