The 9 Physical tests at any TA recruit selection are the same as regular selection (one Army, don't you know!), they are:
3. Body Mass Index
4. Static lift
5. Dynamic lift
7. Back extension
8. Jerry can carry
9. Risk Reduction Run
The tests 1 through to 3 are done during your medical, tests 4 through to 9 are completed during your selection.
The only one that has a 'clear' criteria for failure is the RRR, however, dependant on a PR's career employment group if they are not physically up to it they should (and I emphasise SHOULD) be failed for that CEG and signposted to a CEG more suited to their weedy bodies!