<qa>  How many visits per week will be allowed during the intervention phase?The intervention phase consists of 12 weeks of robot and arm exercise training TTT. Interventions will occur 3 times per week for 12 weeks for a total of 36 visits. Additional time and visits will be allowed with visits occurring 4 times per week or up to 4 additional weeks not to exceed 16 weeks if scheduling conflicts arise. The intervention sessions will be one hour in duration. 